Spec:Item Type: TachometerMaterial: MetalGauge Color: Chrome bracket, white faceBackground Lighting Color: 7 : DC 12V ProfessionalDiameter: Approx. 3.75in/95mmMeasurement Range: 0-8000 RPM Fitment: Universal fit for most 4/6/8 cylinder 12V gasoline-powered vehiclesHow to Use:Red wire ‑ Positive Black wire ‑ NegativeRed wire + white wire ‑ Light Source wire Green wire ‑ wirepacking list:1 x Tachometer1 x Base1 x Heat Shrink Tube4 x Screw1 x Nut1 x ManualNotice:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.