Processing and customization No. Item No. F-555 Specification Oil Gauge + Speed Electroplating Product Type Instrument Type: Tachometer Oil Gauge Color: Silver Material: Aluminum Alloy Package Size: About 9??9??9 cm Size: About 93??70??61 mm Weight: 0.26kg Working voltage: DC12V Indicator light: blue LED (speed)/red LED (oil) How to install and debug the tachometer: 1. Connect the positive and negative poles for normal power supply. 2. Turn on the electric door switch, the tachometer will display 0, then let the signal wire touch the positive pole of the power supply. If the digital display changes, it works fine. 3. Connect the signal cable, start the car, then it can display the speed. The installation and debugging method of the fuel gauge: 1. Connect the positive and negative poles for normal power supply. 2. Turn on the electric door switch, the fuel gauge will display red, and then connect the signal wire to the grid of the negative pole. Wait for a while, the LED lights will all light up slowly, indicating normal operation. 3. Connect the signal line, (please note: the original fuel gauge can not be used at the same time), fill up, and slowly adjust the potentiometer so that all LED lights are on. When the oil runs out, trim the potentiometer so that only one red LED is on. Then, it works fine