STANDARD OUTPUT: Fuel Level Sender and Fuel Gauge are suitable for American standard output 240-33 ohms (240 ohms empty, 33 ohms full). A variety of sizes to meet the cars, boats, yachts, RVs, agricultural vehicles and industrial equipment and other different sizes of fuel tanks NOTE: The output signal of the sensor is 240-33 ohms, so the fuel gauge must be adjusted to: 3/4 (240-33 ohms) to match. Please refer to Figure 2 for more information. Easy to install and connect. Fuel Sending Unit and fuel gauge with various backlight colours are equipped with gaskets, mounting screws and instructions FUEL SENSOR: Fuel Tank Sending Unit is made of 316 stainless steel, SAE 5 hole mounting pattern, NBR material gasket and controlled by high-quality reed switches. It can be corrosion resistance, no rust, stable output signal, long service life, accurate measurement, suitable for Marine applications FUEL GAUGE: With IP67 waterproof and dustproof grade, 316 Stainless Steel Bezel for long-term use even in acid-base and humid environment. Input signal Adjustable:0-190ohm, 240-33ohm, 240-30ohm, 0-180ohm, 10-180ohm; Install diameter: Φ52mm or 2-1/16''; Indication range: E~F; Working voltage: 9-32v dc [ fit 12V-24V Vehicle or Engine] MULTI-COLOUR: Fuel tank gauge with 7 Color Backlight Adjustment : red-yellow-orange-green-blue-purple-white, you can choose which one you want color that press the gauge back button. Connection: Red:+9-32VDC; Black: Signal Input; Orange: Backlight(+); Blue--Ground(-) Fuel Gauge Meter Install diameter: Φ52mm or 2-1/16'', Indication range: E~F, Working voltage: 9-32v dc [ fit 12V-24V Vehicle or Engine]. The level gauge come in a variety of adjustable backlit colors, making them easy to read even in the dark. The Fule/Water Level Sensor with American standard output 240-33 ohms (240 ohms at empty, 33 ohms at full).Refer to the installation diagram for quick and easy installation.