[Size & Compatibility]: The tachometer has a diameter of 5 inches and is suitable for all cars with 4/6/8 cylinder engines. Note: It is not suitable for cars, only for 12V gasoline cars. [Tachometer Accurate Measurement]: Can be used to measure automobile engine Revenue Per Mille, the measurement range is 0-11000RPM. High-precision measuring instrument, clear scale, accurate measurement, can easily understand and control automobile engine Revenue Per Mille, driving [Tachometer Adjustable Light]: Seven-color LED lights bring you an extraordinary visual experience. The car tachometer has a built-in light, which is clear at night. After power on, the product will check and adjust the pointer position by itself. It is a very cool engine tachometer and practical car accessories. [Adjustable Color] Choose the backlight color according to your personal preference. There are 7 colors to choose from. Note:Due to different production batches, there are differences in appearance, which does not affect usage. Light Color:Dark Blue/Yellow/Pink/Light Blue/Green/Red/Transparent. Colour:Black Material:Aluminum Alloy Package Contents: 1 x Car RPM Gauge Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.