Quick Overview – 4-in-1 LCD Digital Meter 12 V/24 V
Get a complete overview of the engine's most important values on a single screen. This 4-in-1 LCD Digital Meter displays battery voltage, water temperature, oil pressure, and fuel level in real-time and is perfect for cars, trucks, RVs, boats, and other vehicles with 12 V or 24 V electrical systems.
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Voltage Range: 9–39 V (withstands voltage spikes up to 40 V).
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Water Temperature: –10 °C to 120 °C, alarm at > 95 °C.
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Oil Pressure: 0–1.0 MPa, alarm at < 0.1 MPa.
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Fuel Level: 5–1000 Ω, alarm at < 10% level.
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Precision: ±0.1% for all measurements.
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Sensor: included M10 NPT 10 mm water temperature sensor.
The meter features built-in flashing alarms to warn of dangerous values and an anti-vibration/anti-bump design that provides stable readings even in harsh environments. The smart self-learning function automatically adapts to fuel sensors with different resistance ranges, making installation easy.
A modern, accurate, and easy-to-install solution for those who want to monitor engine health and electrical systems with a single instrument – peace of mind for both road and water.
12 V/24 V 4-in-1 LCD Digital Meter – Voltmeter, Oil Pressure, Fuel Level & Water Temperature with M10 NPT sensor
The 12 V/24 V 4-in-1 LCD Digital Meter is the next generation of multifunctional instruments, replacing traditional analog gauges. It displays battery voltage (volts), oil pressure, fuel level, and water temperature directly on a clear LCD screen. Utilizing advanced single-chip technology, you get high precision, low power consumption, and long lifespan – perfect for both professional workshops and those looking to upgrade the instrumentation in their car, boat, RV, or truck.
The instrument is designed to withstand harsh environments: strong vibration, significant temperature fluctuations, and high humidity. You get an intuitive and stable measurement that makes it easy to monitor vital engine parameters and avoid costly downtime.
Specifications
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Supply Voltage: DC 9–36 V (handles voltage peaks up to 40 V).
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Operating Environment: –40 °C to +50 °C, 45–75% relative humidity.
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Display: High-resolution LCD with clear backlighting.
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Water Temperature: –10 °C to +120 °C (accuracy ±0.1%). Alarm at > 95 °C.
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Oil Pressure: 0–1.0 MPa (accuracy ±0.1%). Alarm at < 0.1 MPa.
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Fuel Level/Oil Level: Resistance range 5–1000 Ω (accuracy ±0.1%). Alarm at < 10% level.
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Voltage: 9–39 V (accuracy ±0.1%). Alarm at < 10 V, 16–20 V or > 31 V.
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Sensor: Water temperature sensor M10 NPT 10 mm (must be used with the instrument).
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Protection: Strong vibration and shock resistance, built-in alarms and self-protection.
Features & Benefits
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Four meters in one: Voltage, oil pressure, fuel level, and water temperature on a single LCD screen.
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Ultra-wide voltage: Handles voltage variations from 9 V up to 39 V and withstands peaks up to 40 V without malfunction.
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Automatic alarms: Flashing visual warning for too low/high voltage, high coolant temperature (> 95 °C), low oil pressure (< 0.1 MPa), or low fuel level (< 10%).
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Anti-vibration & anti-bump: Stable measurement even when the vehicle is driven on uneven surfaces.
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Quick fuel level sensor setting: Quickly select vehicle type or utilize the built-in self-learning function that automatically matches the sensor's resistance.
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Modern design: Sleek, easy-to-read LCD with low power consumption and long lifespan.
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Wide range of applications: Suitable for cars, trucks, RVs, boats, construction machinery, and stationary engines with 12 V or 24 V systems.
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Easy to install: Simple connection of the included M10 NPT 10 mm sensor and standardized cables.
With the 4-in-1 LCD Digital Meter, you get a complete overview of the engine's most important parameters on a single display. This allows for quicker troubleshooting, safer driving, and minimizes the risk of unexpected breakdowns.
Compatibility
This 4-in-1 LCD Digital Meter is designed for a wide range of vehicles and equipment with 12 V or 24 V electrical systems. It is suitable for:
- Passenger cars and vans that require additional engine data monitoring.
- RVs, trucks, and construction machinery with 24 V systems.
- Boats and marine applications where voltage, oil pressure, and coolant temperature must be monitored.
- Stationary engines, generators, and industrial facilities with 12 V/24 V power supply.
The product works in both gasoline and diesel engines. Thanks to its wide voltage range (9–36 V), it also withstands voltage spikes up to 40 V, making it ideal for environments with high starting currents.
Step-by-step manual and installation guide
Read the entire guide before installation and always use appropriate safety equipment.
Preparations
- Check that all components are included in the package: 4-in-1 LCD meter, M10 NPT 10 mm water temperature sensor, and associated cabling.
- Turn off the ignition and disconnect the battery's negative terminal to avoid short circuits.
- Plan the mounting location so that the display is easily visible and protected from direct moisture and strong heat.
Installation of water temperature sensor (M10 NPT 10 mm)
- Identify a suitable port in the cooling system (e.g., thermostat housing or T-adapter on the radiator hose) with M10 NPT thread.
- Use thread sealant or a copper washer to prevent leaks and carefully screw in the sensor.
- Route the sensor cable towards the meter's location and secure it so that it does not come into contact with hot or moving parts.
Electrical connection
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Red wire: +12 V or +24 V (ignition-switched positive is recommended).
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Black wire: Ground (–), connected to the vehicle's chassis or the battery's negative terminal.
- Other cables are connected to the respective sensors: oil pressure sensor, fuel level sensor, and water temperature sensor (included).
- Secure all cables with zip ties and protect them from heat and vibrations.
- Reconnect the battery's negative terminal and turn on the ignition. Check that the display lights up and shows the correct voltage.
Configuration and calibration
- Select vehicle type for the fuel level sensor via the built-in quick setting function.
- Use the self-learning function if you have a fuel sensor with unknown resistance. The meter automatically learns the sensor resistance.
- Verify that all four parameters – voltage, water temperature, oil pressure, and fuel level – are displayed on the screen.
Usage
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Voltage monitoring: The measuring range is 9–39 V. The display alarms by flashing if the voltage drops below 10 V, is between 16–20 V, or exceeds 31 V.
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Water temperature: Measuring range –10 °C to 120 °C. Flashing alarm at temperatures above 95 °C.
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Oil pressure: Measuring range 0–1.0 MPa. Alarm at pressure below 0.1 MPa.
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Fuel level: Resistance range 5–1000 Ω. Alarm at level below 10%.
Care and maintenance
- Wipe the display and casing with a soft, slightly damp cloth. Avoid solvents.
- Regularly check that sensors and cabling are intact and properly secured.
- If the vehicle is not used for extended periods, disconnect power to minimize battery consumption.
Safety tips
- Always disconnect the battery's negative terminal before making electrical connections.
- Only use included sensors – mixing with other brands can lead to incorrect readings and damage the instrument.
- Mount the unit protected from moisture and extreme heat.
- Double-check all connections before reconnecting power.
Frequently Asked Questions (FAQ)
What four measurements does the meter display?
It displays battery voltage (Volts), water temperature (°C), oil pressure (MPa), and fuel level/oil level on a single LCD screen.
Does it work on both 12 V and 24 V vehicles?
Yes. The meter has an operating range of 9–36 V and can handle voltage spikes up to 40 V, making it suitable for both 12 V and 24 V systems.
Does the instrument have built-in alarms?
Yes. Flashing visual warning at:
- Voltage below 10 V, between 16–20 V, or above 31 V
- Water temperature above 95 °C
- Oil pressure below 0.1 MPa
- Fuel level below 10%
Do I have to use the included sensors?
Yes. The instrument and sensors are matched. Mixing with other brands can lead to inaccurate measurements or damage to the equipment. Any damage will not be covered by warranty.
Can the meter handle vibrations?
Yes, it is designed with anti-vibration and anti-bump for stable operation even in harsh environments.
How does the self-learning function for the fuel sensor work?
The meter can automatically adapt to fuel sensors with different resistance ranges (5–1000 Ω). This simplifies installation even when exact sensor data is missing.
What is the accuracy of the measurements?
All parameters (volts, water temperature, oil pressure, fuel level) have a measurement precision of approximately ±0.1%.
Can I use it in a boat or RV?
Yes. The wide voltage compatibility and resistance to vibrations make it suitable for marine environments and RVs as well.
What happens if the voltage exceeds 40 V?
The instrument is designed to withstand short-term spikes up to 40 V, but continuous operation above 36 V is not recommended.
Tips & advice
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Mount sensors carefully: Use thread sealant or a copper washer to prevent leaks.
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Protect cabling: Route cables away from moving or hot engine parts, use corrugated tubing and zip ties.
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Ignition-switched positive: Connect the meter's red wire to a fused, ignition-switched +12/24 V to avoid battery discharge.
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Verify alarm levels: Confirm that the alarms for voltage, temperature, and oil pressure work after installation.
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Service interval: Regularly check that sensors and cabling are in good condition for maintained precision.
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Calibrate fuel level: Use quick setting or self-learning to match the sensor resistance to the meter.
Troubleshooting
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No display: Check fuse, supply voltage, and that red/black are correctly connected.
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Incorrect voltage reading: Measure the supply voltage directly at the battery – voltage drop can occur in overly long or thin cables.
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No signal from sensor: Check cabling and that the sensor is correctly installed and connected.
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Unexpected alarms: Check sensor placement, cooling system bleeding, and ground connections.
Package Contents
- 1 × 4-in-1 LCD Digital Meter (9–36 V)
- 1 × Water Temperature Sensor M10 NPT 10 mm
- 1 × Cables and quick guide (content may vary slightly depending on version)
Important Notes & Disclaimer
This product is intended for 12/24 V vehicle use. Always follow the included installation instructions and only use the sensors provided.
Mount the instrument in a location protected from direct water ingress and extreme heat/cold. Operating temperature for the display: –40 °C to +50 °C.
Incorrect installation, use of incompatible sensors, or operation outside specified specifications can lead to inaccurate measurements or damage to the vehicle's system.
The manufacturer reserves the right to update product specifications without prior notice. Use is at your own risk.
Summary
The 12 V/24 V 4-in-1 LCD Digital Meter gives you full control over voltage, water temperature, oil pressure, and fuel level on a single high-resolution LCD screen. With a self-learning fuel sensor, wide voltage compatibility, and built-in alarms, this is the perfect choice for anyone who wants to monitor their engine and electrical system in a modern and reliable way.
