Features: Measurement：Used to measure the RPM of automobile engine，Measurement range is 0~8000RPM. Apply to：Works on 1 2 3 4 5 6 7 8 cylinder gasoline vehicles or 1 - 2 cylinder new motorcycles.Adjustable shift light on face. Gauge：Bring you a more cool engine tachometer, the backlight uses blue light, and gasoline cars add interesting auto accessories. Note:NOT suitable for diesel vehicles, Only for 12V petrol vehicles. Adjustable Shift Light: The built-in adjustable shift light on the face of the tachometer gauge alerts you when it's time to shift gears, optimizing your driving efficiency and preventing engine strain. Package List: 1 * 3.75" Tachometer Gauge 1 * Installation Instruction 1 * Package of fitting Notes: 1.Please allow 0.1-0.5cm difference due to manual measurement.