A hole with 85mm(3-3/8") dimension and 55mm(2-3/16") depth on dashboard or an extra gauge holder. Screw-mount style installation. If you need gauge holder, pls. search for B07M8TMZW2
Red or yellow backlight. 9-32VDC(12VDC/24VDC) Working Voltage
Diesel Speed Ratio: 0.5-250.0 adjustable, You can press the back button to adjust it. Idle speed is typically 600-800rpm. Details refer to owner manual.
Suitable for diesel and gasoline engine. Tachometer can get signal from engine, ignition coil, crankshaft sensor, or tacho sensor (be sold separately), etc. If you need tacho sensor, pls. search for ASIN NO. B075NL55CQ or B075NDSB2T
IP67 Waterproof and dustproof grade. Work up to 1m underwater.