Tacho Gauge Red Backlight Waterproof Tachometer for Boat Feature:1. Wide Compatibility: Allows for wide application on RV, yacht, fishing boat, ship, motorcycle, automobile modification and other fields.2. Useful Tachometer: Able to display water temperature, oil pressure and speed, also has wide measurement range of 0-4000RPM and 0.0-99,999.9h accumulated engine hours.3. Premium Materials: Made of stainless steel front frame and anti fog curved glass cover, which can be used for a long time even in humid environments, and is very suitable for harsh marine environments.4. Reliable Working: Ultra wide working voltage design enables stable working under DC 9-32V, while the red backlight for easier reading. Waterproof, high accuracy, small power consumption, quick start up.5. Easy to Install: Comes with a light weight and a compact size as well, the convenient installation can be quickly completed in minutes.Specification:Item Type: TachometerMaterial: Stainless steel frame, anti fog glass, PC. Color: Black DiscTachometer Display Range: 0-4000RPMAccumulated Engine Hours: 0.0-99,999.9hBacklight Color: RedWorking Voltage: DC 9-32VInstallation Dimension: Approx. 85mm / 3.35inFunction Display: Water temperature, oil pressure, speed. Application: For RV, yacht, fishing boat, ship, motorcycle, automobile modification and other fields.Package List:1 x Tachometer1 x User Manual How to use: Openaholewithadiameterof85mmontheinstrumentmountingplate,andensurethatthereisatleast55mmspacebehindtheinstrumentpanel.