Item Type: Tachometer_x000D_ Material: Plastic_x000D_ Application: Fit For 4 6 8 cylinders speedometer_x000D_ Specification: _x000D_ Diameter: Approx. 52mm/2in_x000D_ Indicating Range: 0-10000 RPM_x000D_ Housing Color: Silver_x000D_ Voltage: 12V_x000D_ _x000D_ _x000D_ Wire Connection: _x000D_ Black-negative_x000D_ Red-positive_x000D_ Green-signal line 152mm/2in Universal type, with measuring range of 0?10000RPM, which is made to meet your needs. 2Use a stepping motor to improve sensitivity, and the numbers and pointers are clearly displayed on the dial, which is easy to read in the dark. 3Easy to install, use English user manual, it is strongly recommended that most cars or motorcycles use professional installation. 4With simple wiring, black connects to negative, red connects to positive, green connects to signal line. 5Safe plastic material, not easy to damage your car and can avoid unnecessary losses. 1 x Instrument 1 x Power Cord 1 x Manual