Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si Be suitable for all kinds of tacho RPM sensors, and display the speed of the engine. IP67 waterproof and dustproof grade. With curved glass (with anti-fogging function) With ultra-wide working voltage design( long-term operating voltage: 9-32V, Maximum up to: 36V (less than or equal to 1 min)). Technical Data: Indicating Range: 0-9990RPM Speed : 1-300 adjustable Working Voltage: 9-32V(12V/24V) Backlight: Red Functions: current tacho/RPM and hour Operation mode: LCD display, colour:black Material:ABS size:52mm Package Contents: 1x Tachometer 1x Multi-plug socket 1x Installation Instruction Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.