Feature: 1. VERSATILE COMPATIBILITY: Suitable for gasoline engines, this gauge displays rpm and hours, with a range of 0-6000RPM and adjustable speed ratio of 1.0-360. 2. 7 COLOR BACKLIGHT: Choose from red (default), green, blue, white, yellow, cyan, purple, or automatic color cycling, bringing you professional and dependable use. 3. PREMIUM DESIGN: This 6000RPM tachometer operates on DC 9 to 32V and features a 52mm (2in) size. Accurate pointers and numbers bring you dependable data. 4. ENDURING STRUCTURE: With a sturdy metal construction, not easy to crack and damage, this tachometer is built to last in various automotive and marine applications. 5. EASY INSTALLATION: 52mm 6000RPM tachometer fits into a 2in hole, with 55mm clearance needed behind the panel. Simply screw in place, giving you a convenient setup. Specification: Item Type: Tachometer Voltage: DC 9-32V Size: Approx. 52mm /2in Seven Backlight Colors: Red (default), Green, Blue, White, Yellow, Cyan, Purple, Auto Auto: Switches every minute according to the above sequence Fitment: Suitable for Trucks, Tractors, Cars, RVs, Boats . Package List: 1 x Tachometer 1 x User Manual