2-in-1 LCD Water Temperature Gauge & Voltmeter 12V/24V – Digital Car Instrument with 10mm Temperature Sensor
€13,95 EUR
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Quick Overview
The 2-in-1 LCD Water Temperature Gauge & Voltmeter (12V/24V) is a compact digital instrument that combines two critical readings in one display: coolant temperature and battery/charging voltage. The gauge comes with a dedicated 10 mm temperature sensor and is built for easy installation, stable operation, and high readability even in bright sunlight thanks to its built-in sunshade and optimized brightness. It uses imported key components for better precision, long lifespan, and low power consumption. Typical applications include street cars, track days, drifting, off-road/overland, RVs, commercial vehicles, trucks (24V), and classic vehicles where additional instrumentation is desired.
The temperature measurement range is −10 °C to 139 °C (equivalent to −10 °F to 282 °F) with an accuracy of approximately ±1%. A built-in temperature alarm function (adjustable approx. 95–120 °C) triggers a flashing display if the cooling system gets too hot, helping you detect problems early. The voltmeter provides a quick check of battery health and alternator charging (12V or 24V systems). The gauge is vibration-resistant, shock-proof, and designed for horizontal mounting with a clear, easy-to-read LCD.
Installation is straightforward: red wire to +12/24V, red/black to ground, sensor mounted in the cooling circuit (10 mm seat/adapter). The cable (approx. 60 cm) is often sufficient for dashboard mounting; for longer runs, extension with shielded cable may be appropriate. Important: do not mix sensors/instruments from other brands – this gauge must be used with the included sensor for accurate readings. With a complete manual, tips, and FAQ below, this is an affordable, reliable, and beginner-friendly solution for monitoring temperature and voltage in real-time.
2-in-1 LCD Water Temperature Gauge & Voltmeter 12V/24V – Digital Car Instrument with 10 mm Temperature Sensor
Introduction
This 2-in-1 digital car gauge combines a water temperature gauge and a voltmeter in one sleek LCD instrument for 12V and 24V electrical systems. Thanks to an updated design with a sunshade, you can read clear digits even in direct sunlight, and optimized brightness provides comfortable viewing in the dark without glare. The construction is designed for stability, low energy consumption, and long lifespan, with imported quality components ensuring precision and operational reliability.
The water temperature sensor (10 mm) is included and works specifically with this instrument to ensure accurate readings. The gauge also features an alarm signal via flashing display when the temperature reaches a set alarm level (reference range 95–120 °C), allowing you to react in time if the cooling system overheats. The voltmeter shows the system voltage in real-time, which is practical for monitoring alternator charging, battery condition, and voltage drops under high load.
Whether you commute daily, drive hard on the track, tow trailers on long inclines, or want to protect an older engine – this gauge provides early warnings and valuable insight into the engine and electrical system. The horizontal form factor makes it easy to discreetly place on the dashboard, in a panel, or on a steering column cover, and its vibration-resistant mounting keeps the digits stable even on rough roads.
Specifications
Product: Water Temperature & Voltage – 2-in-1 LCD Gauge
Display: Digital LCD, horizontal mounting, sunshade for readability in sunlight
Temperature Range: −10 °C to 139 °C (≈ −10 °F to 282 °F)
Accuracy: approx. ±1%
Operating Environment (instrument): 0–50 °C
Temperature Alarm: approx. 95–120 °C (flashing display upon alarm)
Electrical System: 12V or 24V DC
Power Supply/Cables: Red = +12/24V; Red/Black = Ground (−); cable length approx. 60 cm
Sensor: Water temperature sensor 10 mm (must be used with this instrument)
Power Consumption: Low (optimized for vehicles)
Build Quality: Imported key components for stability & longevity
Tip: Larger deviations may indicate a weak battery, poor ground, alternator failure, or high load.
Benefits – why this 2-in-1 gauge is a good choice
Two gauges in one: Saves space and wiring.
Clear display in all light: Sunshade + optimized brightness.
Overheat alarm: Flashing warning saves engine in time.
Quick installation: Simple +/− power and dedicated sensor.
Power-efficient and long-lasting: Built for daily vehicle use.
Robust: Anti-vibration/anti-shock for harsh environments.
Do you want to complement with more instruments? Feel free to explore our internal categories such as temperature gauges and voltmeters for matching products.
Compatibility & Installation Environment
Designed for vehicles with 12V or 24V electrical systems (passenger cars, light commercial vehicles, certain trucks/RVs). Temperature is measured via the included 10 mm water temperature sensor – the instrument and sensor are matched and should not be mixed with sensors/instruments from other manufacturers.
To install the sensor, a 10 mm seat in the cooling system is required (e.g., in the thermostat housing, manifold, adapter in the upper radiator hose, or sensor fitting in a cooling pipe). If no 10 mm seat is available, a hose adapter/T-fitting with a 10 mm port can be used, or a workshop can weld in a sensor plug (always follow good professional practice).
Environment
Example
Note
12V
Passenger car, pickup, off-road
Direct feed via ACC or fused +12V
24V
Truck, RV
Direct feed via fused +24V
Sensor placement
Thermostat housing / upper radiator hose
Ensure tightness and bleeding
Note! Avoid aggressive chemicals/vapors on the display and electronics. Do not place the gauge where it will be exposed to direct water splashes into the casing.
Installation & Manual 🔧
Important before you start
Work on a turned off engine and cold cooling system (risk of burns from hot coolant!).
Disconnect the battery's negative terminal when wiring.
Plan wiring so that cables are protected from heat, moving parts, and sharp edges.
Prepare a hose adapter/port with a 10 mm sensor connection if not available from the factory.
Have fresh coolant, hose clamps, and thread sealant (PTFE tape or glycol-resistant thread paste) ready.
Tools & materials
Screwdrivers, sockets, wrenches
Pliers for clamps, wire cutters, wire strippers
Electrical tape/heat shrink, terminals (ring terminal for ground), zip ties
PTFE tape/thread paste (for sensor thread depending on seat)
Hose adapter/T-fitting with 10 mm port (if needed)
1–3A in-line fuse holder for the +12/24V power supply
Multimeter for checking voltage/ground
Catch pan for coolant and filling equipment
Electrical connection (basic)
Identify a suitable ignition-switched positive (ACC) or fused constant positive depending on how you want the gauge to be active.
Install a 1–3A fuse near the power source on the red wire.
Connect the Red wire to +12/24V after the fuse.
Connect the Red/Black wire to a good chassis ground (scrape clean to bare metal, use a ring terminal).
Verify with a multimeter: ~12–14.7V (or 24–29.4V) between red and ground when ignition is on.
Mounting the temperature sensor
Locate a suitable place for the sensor: thermostat housing, engine block port, or a T-fitting in the upper radiator hose. The seat should be 10 mm.
Drain enough coolant to install the sensor without spills.
Use thread sealant according to the manufacturer's recommendations and screw in the sensor without overtightening.
Reassemble hoses/clamps and tighten properly. Ensure the sensor cable has strain relief.
Route the sensor cable along existing wiring harnesses towards the cabin. Secure with zip ties, keep distance from the exhaust system.
Connect the sensor connector to the instrument according to marking.
Mounting the instrument
Choose a location on a horizontal surface with good visibility, e.g., dashboard.
Degrease the surface and attach the instrument with the included holder/tape/screw (depending on the design).
Arrange wiring so that cables are not pinched or unnecessarily visible.
Refilling & bleeding the cooling system
Refill coolant according to the vehicle manufacturer's specifications.
Start the engine and let it idle with the heater on maximum (if applicable) to circulate coolant.
Monitor for leaks at the sensor/connections. Top up the level and bleed according to the car's procedures.
First startup & function check
Turn on ignition. The display should light up and show voltage and temperature (cold engine ≈ ambient).
After a test drive, the temperature should rise to normal operating temperature (usually 80–105 °C depending on the car).
Check that the alarm triggers (display flashes) if the alarm threshold is exceeded.
Alarm adjustment (if applicable)
Some batches have a fixed alarm level within 95–120 °C. If your model supports adjustment: follow the menu instructions in the included manual to select the desired alarm level.
Troubleshooting
No display: Check fuse, +/− connections, ground point, ignition position.
Incorrect voltage: Measure directly on the battery. Large difference indicates poor ground or voltage drop – fix wiring/contacts.
Temperature shows unreasonable values: Air in the system, poor contact, incorrect placement, or leaky sensor. Bleed the system, secure sensor mounting and cable.
Leakage at sensor: Replace sealing material, check thread fit, do not overtighten.
Interference/flickering: Separate signal cables from ignition cables/high current lines, use shielded cable for extension.
Maintenance
Check terminals, ground point, and sensor mounting during service.
Clean display/sunshade with a soft cloth – avoid solvents.
Verify alarm function at the start of the season (monitor temperature during warm-up).
Tips & Advice 💡
Placement: The upper radiator hose provides a quick response to the actual engine temperature going to the radiator.
Sealing: Use PTFE tape or approved thread paste according to the seat material (aluminum/steel).
Ground: A strong ground minimizes noise and incorrect readings – short, thick cable to clean chassis ground.
Fuse: Always protect the power supply with a 1–3A fuse near the source.
Cable routing: Keep distance from the exhaust system; use cable protection where heat/sharp edges exist.
Alarm level: Set a realistic limit based on your engine (usually 100–110 °C for modern gasoline; follow OEM data).
Voltage diagnosis: If voltage dips during driving – check alternator belt, ground straps, and battery age.
Frequently Asked Questions (FAQ)
Does the gauge fit both 12V and 24V?
Yes, the gauge is designed for vehicles with 12V or 24V electrical systems.
Which sensor is included?
A dedicated 10 mm water temperature sensor that is matched to the instrument.
Can I use another 10 mm sensor I have at home?
No. The instrument and sensor in this package must be used together. Mixing with other brands can lead to incorrect readings or damage.
Where should the sensor be mounted?
In a 10 mm seat in the cooling circuit, e.g., thermostat housing or via a T-adapter in the upper radiator hose.
What happens if it overheats?
The display flashes as an alarm when the set threshold is reached (≈95–120 °C).
Can I set the alarm level?
Some versions have a fixed level, others are adjustable within the range. Follow the included manual for your batch.
How long is the cable?
Approx. 60 cm from the instrument. If needed, you can extend it with correctly sized/shielded cable.
Does the gauge display Fahrenheit?
The measurement range is also specified in °F (−10 °F to 282 °F), but the display is usually in °C. Refer to the batch manual for the display mode.
Is the gauge vibration resistant?
Yes, the design is anti-vibration/anti-shock for vehicles.
Is it waterproof?
It is intended for mounting in the cabin/panel. Avoid direct water splashes onto electronics and connectors.
Can I use it in a boat?
Only in a dry area and with correct 12/24V DC. Observe marine environmental requirements and corrosion protection.
Does the voltmeter show charging problems?
Yes, it displays system voltage in real-time – useful for seeing charging status and voltage drops.
Do I need a special fuse?
Yes, a 1–3A in-line fuse between the power source and the instrument's red wire is recommended.
Can I install it myself?
Yes, with basic tool proficiency. If in doubt – consult a professional workshop, especially for interventions in the cooling system.
Does it show oil temperature?
No, the sensor is for water temperature. For oil, a separate gauge/sensor is required.
Is the display dimmable?
The brightness is optimized for clarity without glare. Dimming functionality may vary per batch.
How is the gauge calibrated?
The gauge is factory-calibrated for its sensor. Use only the included sensor.
What do I do if the reading fluctuates?
Check the ground point, cable splices, and separate the signal cable from ignition cables/high current.
What is normal operating temperature?
Usually 80–105 °C depending on the engine. Follow the vehicle's OEM specification.
Package Contents 📦
1 × 2-in-1 LCD water temperature gauge & voltmeter (12/24V)
1 × 10 mm water temperature sensor (matched to the instrument)
1 × Cable set (red +, red/black −)
1 × Quick manual
Note! Minor variations may occur. See the content list for your specific batch.
Disclaimer & Important Notes ⚠️
Do not mix this instrument with sensors from other manufacturers or vice versa. This can cause incorrect readings or damage.
Work on the cooling system should be done on a cold engine. Always follow the vehicle's service instructions.
Electrical interventions must be secured with an appropriate in-line fuse and proper grounding.
Specifications are subject to change without prior notice. Images/designs may vary.
Installation is at your own risk. If in doubt – consult a qualified workshop.
Summary
The 2-in-1 LCD Water Temperature & Voltmeter provides you with critical real-time information on both coolant temperature and battery/charging voltage in a single, easy-to-read instrument. With a sun-protected LCD, low power consumption, robust construction, and a flashing alarm for high temperature, it's a smart choice for everything from daily commuting to track days, heavy-duty work, and long journeys. The dedicated 10 mm sensor ensures accurate measurement – provided it is used in conjunction with this specific gauge, according to the manufacturer's explicit instructions. Installation is straightforward, and the guide above provides clear steps for electrical setup, sensor mounting, and commissioning.
Want to expand your instrumentation further? Check out our internal selection of temperature gauges and voltmeters to create a unified panel with the same style and function.
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Tack för din feedback! Vi är glada att höra att du upplevde vår produkt som snabb och smidig. Det är precis vad vi strävar efter att erbjuda våra kunder. Tveka inte att kontakta oss om du behöver hjälp med något annat. Tack igen för din recension!
