Feature:1. WIDE INDICATING RANGE: The car tachometer features an indicating range from 0 to 3000 RPM, with an adjustable speed ratio from 1.0 to 360, allowing for versatile and precise measurement tailored to your vehicle's needs.2. VERSATILE ENGINE COMPATIBILITY: Designed for use with both derv and gasoline engines, this tachometer efficiently displays RPM and hours, making it suitable for a wide range of vehicles.3. DUAL FUNCTIONALITY: Not only does this tachometer display RPM, but it also functions as an hourmeter, providing essential engine data. Hourmeter cannot be reset.4. STABLE PERFORMANCE: Engineered for durability and accuracy, the car tachometer ensures dependable performance, delivering essential engine metrics crucial for monitoring.5. EASY INSTALLATION: Simply cut a 52mm (2in) hole in your panel and ensure a clearance of 55mm behind it to fit the tachometer. Insert the gauge into the hole and secure it with screws for a straightforward installation process.Specification:Item Type: RPM SpeedometerMaterial: MetalVoltage: DC 9-32VSize: 52mm (2in)Seven Color Backlight: Red (default), Green, Blue, White, Yellow, Cyan, Purple, AutoAuto Mode: Switch every minute according to the above sequenceFitment: for Trucks, Tractors, Cars, RVs, Boats.Package List:1 x Tachometer1 x User Manual