52mm/2in Universal 7 Colors Tachometer Revolution Meter with Measuring Range 0?10000RPM 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 Material: Plastic Application: Fit For 4 6 8 cylinders speedometer Specification: Diameter: Approx. 52mm/2in Indicating Range: 0-10000 RPM Housing Color: Silver Voltage: 12V Wire Connection: Black-negative Red-positive Green-signal line