Feature: 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 Cylinder Setting: Pressing front switch and hold it 5 seconds enter into set the cylinders Wire Connection: Black-negative Red-positive Green-signal line. Package List: 1 x Instrument 1 x Power Cord1 x Manual Note: This model is suitable for most 4/6/8 cylinder 12V gasoline carsProducts support rectangular wave, peak wave speed signal.The tachometer pointer needs power to reset to zero.