1Tachometer with Hour Meter: The 85mm tachometer uses a stepper motor to drive the pointer, which accurately displays the engine speed 0?3000RPM and the accumulated hours 0.0?99999.9H. 2Waterproof: Made of stainless steel cover ring and curved glass cover, with anti fog, waterproof and dustproof functions, which is very suitable for harsh sea environment. 3High Accuracy: With a red backlight for night viewing. The pointer display has the characteristics of high indication accuracy, strong universality, reliability, stability and ease of use. 4Energy Saving: Ultra wide working voltage design, working power 9?32V, low power consumption, long service life, high precision, short starting time. 5Wide Application: Tachometer gauge can also be used for a long time in acid, alkali and humid environments, and can be used in Rv vehicles, yachts, fishing boats, ships, auto modification and other fields.