Description Features: 1. 2 in 1 design, it is a combination of digital tachometer and voltage display for motorcycle. 2. The housing is 6 chromed electroplating, durable and light. 3. The housing is made of high quality metal material, which has better waterproof effect. 4. Featuring excellent workmanship, stable quality and long lifespan. 5. It is universal for all types of motorcycle, easy installation and practical. 6. A necessary equipment that can help you to know the condition of the tachometer Specification: Condition: 100% Brand New Item Type: Tachometer Color: Silver Housing Material: High Quality Metal Voltage: 12V DC LED Color: Red & Blue Voltmeter: for meauring voltage of motorcycle Wiring Instructions: The red wire is connected to the positive pole and the black wire is connected to the negative pole. The emission detection wire is the green wire (the engines ignition induction line, or the ignition line from the ignition coil to the positive line) Fitment: Universal Tachometer installation and debugging method: 1. Connect the positive and negative poles to the power supply correctly. 2. Turn on the electric door switch, the tachometer will display 0, then let the signal line touch the positive pole of the power supply. It works fine if the digital display changes. 3. Connect the signal line, start the car, and the speed can be displayed. How to install and debug the fuel gauge: 1. Connect the positive and negative poles to the power supply correctly. 2. Turn on the electric door switch, the fuel gauge shows a red grid, then connect the signal wire to the negative pole. Wait for a while, the LED lights will all light up slowly, indicating normal operation. 3. Connect the signal line, fill it, and slowly adjust the potentiometer to make all the LED lights on. When the oil runs out, adjust the potentiometer slightly so that only one red LED lights up.