Suitable for various tacho RPM sensors, displaying engine rotation speed. IP67 rated for waterproof and dustproof performance. Features curved glass with anti-fogging functionality. Designed with ultra-wide operating voltage: long-term operation from 9-32V, with peak tolerance up to 36V for no more than 1 minute. Technical Data: Indicating Range: 0-9990 RPM Speed Ratio: Adjustable from 1 to 300 Working Voltage: 9-32V (compatible with 12V and 24V systems) Backlight: Red Functions: Real-time tacho/RPM and hour meter Operation Mode: LCD display with stepper motor Color: Black Material: ABS Size: 52mm Package Contents: 1 x Tachometer 1 x Multi-plug socket 1 x Installation instruction Note: Lighting conditions and monitor settings may cause slight color variations between the product image and actual item. Measurement error allowance: +/- 1-3 cm.