1. More sensitive than general instruments, which can display data accurately. 2. The lighting on dial makes it easy to read in dark and brings much convenience . 3. An instrument with 7 colors can adapt to needs of more environments, and it is very convenient to switch colors by buttons. 4. Can add look and feel of a racing car to your riding, with high quality and light weight. 5. After exquisite craftsmanship and professional processing, this car tachometer has good performance and can well meet your needs. Item Type:Car Tachometer Unit:Revolutions Per Minute Display Range:0-11000 RPM Dial Dimater:. 80 mm / 3.15in Accessories:Suitable for Most 1-8 (1,2,3,4,5,6,7,8) Cylinder 12V Gasoline Vehicles Power Supply:DC(10-15V) 12V Professional How to Use: Wiring: Red wiring‑positive Black wiring‑negative Red + white wiring‑light source line Green wiring‑signal line Yellow wiring‑signal line Color:As Shown Material:ABS+Metal Package Contents: 1 * Car Tachometer 1 * Alarm Lamp 1 * Gasket 2 * Double-Sided Tape 1 * Rubber Pad 2 * Screw 2 * Meter Cover 2 * Bracket 1 * Shift Button 1 * electric wire 1 * English instruction manual Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.