Note: It fits for gasoline engine， NOT for diesel engine.Features:Numbers and pointer clearly show the RPM.Blue LED light for easy reading in the darkness.Measurement range is 0~8000RPM.Suitable for 4，6，and 8 cylinder.High sensitivity and easy operation.Used to measure the RPM of automobile engine.Specifications:Color: SilverUnit: RPMMeasurement range: 0~8000RPMPower: 12V DC， Max. 0.3ATachometer size: 5.7 * 6.5cm / 2.2 * 2.6in (max. diameter * height)Tachometer weight: 117g / 4.1ozPackage size: 17 * 12 * 7.8cm / 6.7 * 4.7 * 3.1inPackage weight: 275g / 9.7ozPackage including:1 * Tachometer1 * Hose2 * Screws1 * Gauge Holder1 * Rubber Ring