Suitable for various tacho RPM sensors, displaying engine rotation speed. IP67 waterproof rating. Features curved glass with anti-fogging function. Ultra-wide working voltage design: long-term operating voltage 9-32V, up to 36V for less than or equal to 1 minute. Technical Data: Indicating Range: 0-9990 RPM Speed: Adjustable 1-300 Working Voltage: 9-32V (compatible with 12V/24V systems) Backlight: Red Functions: Current tacho/RPM and hour meter Operation Mode: LCD display, color black Material: ABS Size: 52mm Package Contents: 1 x Tachometer 1 x Multi-plug socket 1 x Installation Instruction Note: The package includes only the items listed above. Light and display differences may cause slight color variations between the image and actual item. Measurement error allowed: +/- 1-3 cm.