Description: Instrument type: Tachometer & Fuel Level Gauge Color: Chrome Material: Metal Working voltage: DC 12V Indicator: blue LED (tachometer) / red LED (oil) Wire connection: red-positive, black-negative, yellow-oil sensor signal, green-speed signal. Specification: Tachometer installation and debugging method: 1. Connect the positive and negative pole to power supply correctly. 2. Turn on the electric door switch, tachometer will display to 0,and then let the signal line touch the positive pole of power supply. If the digital display changes, it can work normally. 3. Connect the signal cable, start the car, and then it can display speed. Fuel gauge installation and debugging methods: 1. Connect the positive and negative pole to power supply correctly. 2. Turn on the electric door switch, fuel gauge displays a grid of red,and then connected signal line to the negative pole. Wait for a while, LED light will all light up slowly, indicating normal operation. 3. Connect the signal line, fill up, slowly adjust the potentiometer to make all the LED lights on. When oil runs out, slightly adjust potentiometer so as to make only one red LED light on.(Please note: The original fuel gauge can not be used together) Package Includes: 1 Piece Tachometer andFuel Level Gauge