Features:
Used to measure the RPM of automobile engine.
Measurement range is 0~8000RPM.
High accuracy and easy operation.
Works on 4, 6, and 8 cylinder engines.
Adjustable shif t light on face.

Note:
1. It's normal the pointer is not zero in the absence of installation. After power-on, the product will check and adjust the pointer by itself.
2. If the product pointer is still not zero after power-on, can start normally, when the pointer is above zero, it can be restarted to adjust the pointer after power-off.

Specifications:

Color: Black 
Material: ABS
Input Voltage: 12V
Package Size: 14 * 14 * 14cm / 5.5 * 5.5 * 5.5in
Weight: 367.5g / 13oz

Package List:
1 * 3.75" Tachometer Gauge
1 * Installation Instruction
1 * Package of fitting

Note:

NOT suitable for diesel vehicles, Only for 12V petrol vehicles.