Features: 1.Adopts stepping motor for high sensitivity, can accurately display car rotate speed. 2.0?10000RPM display range, can indicates the operating status of the engine. 3.With white numbers on the dial, red pointer plus black dial, clearly to read and use. 4.With lighting on the dial, you can easily read the results even in the darkness. 5.52mm/2in tachometer, easy installation with users manual in english, perfectly matching. Specification: Item Type: Tachometer_x000D_ Material: Plastic_x000D_ Display Range: 0-10000RPM_x000D_ _x000D_ Diameter: Approx. 52mm/2in_x000D_ _x000D_ Current: IGN Maximum 0.3A ILM 0.3A_x000D_ _x000D_ Power: DC(10-15V) 12V Professional_x000D_ _x000D_ Fitment: Universal for 12V 4/ 6/ 8 cylinder gasoline vehicles_x000D_ _x000D_ _x000D_ Wiring:_x000D_ Red---Positive_x000D_ Black---Negative_x000D_ Yellow+Red---Light Source_x000D_ Green---RPM Line Note: Professional installation is highly recommended for most of cars or motor.