Features: 1.52mm/2in Universal type, with measuring range of 0?10000RPM, which is made to meet your needs. 2.Use 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. 3.Easy to install, use English user manual, it is strongly recommended that most cars or motorcycles use professional installation. 4.With simple wiring, black connects to negative, red connects to positive, green connects to signal line. 5.Safe plastic material, not easy to damage your car and can avoid unnecessary losses. Specification: Item Type: Tachometer_x005F_x000D_ Material: Plastic_x005F_x000D_ Application: Fit For 4 6 8 cylinders speedometer_x005F_x000D_ Specification: _x005F_x000D_ Diameter: Approx. 52mm/2in_x005F_x000D_ Indicating Range: 0-10000 RPM_x005F_x000D_ Housing Color: Silver_x005F_x000D_ Voltage: 12V_x005F_x000D_ _x005F_x000D_ _x005F_x000D_ Wire Connection: _x005F_x000D_ Black-negative_x005F_x000D_ Red-positive_x005F_x000D_ Green-signal line