Suitable for various tacho RPM sensors, this device displays engine rotation speed. Features IP67 waterproof rating and a curved glass lens with anti-fogging function. Designed with ultra-wide operating voltage: long-term 9-32V, up to 36V for no more than 1 minute. Technical Data: Indicating Range: 0-9990 RPM Speed: Adjustable from 1-300 Working Voltage: 9-32V (compatible with 12V/24V systems) Backlight: Red Functions: Current tacho/RPM and hour meter Operation Mode: LCD display, black screen Material: ABS Size: 52mm Package Contents: 1 x Tachometer 1 x Multi-plug socket 1 x Installation Instruction Note: Light and screen display differences may cause slight color variation between the product image and actual item. Measurement error allowance is +/- 1-3cm.