Cut an 85mm (3 3/8") hole in the panel and allow a clearance of 70mm (2 3/4”) behind the panel to fit the gauge. Put the gauge in the hole and screw down.
Speed Ratio: 1-300 adjustable, You can press the back button to adjust it. Idle speed is typically 600-800rpm. Details refer to owner manual.
Suitable for diesel 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. B07RN3HJ72 or B07RR8NQ45
Red Backlight, 9-32VDC(12VDC/24VDC) Working Voltage