1LED tachometer, the lighting color can be switched freely by button between white and red. 2Tachometer gauge with high response and accuracy, 09000RPM measure range, convenient to use. 3Support peak display function, allows you to show your highest reading with a light push of a button. 460mm/2.5in tachometer, universal for 4/6/8 cylinder 12V gasolinepowered vehicles. 5Easy to install with detailed installation and wiring instructions, no need complicated tools. Item Type: Tachometer GaugeMaterial: PlasticPower: DC 12V ProfessionalDiameter: Approx. 60mm/2.5inUnit: RPMMeasure Range: 0-9000RPMFitment: Universal for 4/6/8 Cylinder 12V Gasoline-Powered VehiclesWiring:Red---PositiveBlack---NegativeYellow+Red---Light Source LineWhite+Red---Light Source Line 1 xTachometer Gauge1 x Gauge Housing1 x Gauge Cover2 x Screw1 x Rubber Ring3 x Power Cord1 x Manual Easy installation with users manual in English.Professional installation is highly recommended.