Features: 1IP67 Waterproof: The 4000RPM engine tachometer is made of 316L stainless steel bezel and anti fog curved glass, which can be used for a long time even in acid base and humid environments. 2High Accuracy: The engine tachometer uses a stepping motor to drive the pointer, which accurately displays the engine speed from 0?4000RPM, which is suitable for various vehicles such as cars, trucks, boats, etc. 3Hourmeter: The tachometer can accurately display the accumulated hours of the engine from 0.0 to 99999.9H, with a red backlight for night driving, with strong versatility and ease of use. 4Wide Voltage Design: The long term working voltage of the 4000RPM engine tachometer is 9?32V, up to 36V, with low power consumption, long life and short start up time. 5Shockproof: Buckle design, strong connection, make the instrument work even under strong vibration, can be used in engines, ships, construction machinery, etc. Package included: 1 x Tachometer 1 x Manual