Cut an 85mm (3 3/8") hole in the panel and allow a clearance of 55mm behind the panel to fit the gauge. Put the gauge in the hole and screw down.
Speed Ratio: 1.0-360 adjustable, you can press the back button to adjust it.
Suitable for diesel engine and gasoline engine. Tachometer can get signal from engine, ignition coil, crankshaft sensor, or tacho sensor (be sold separately), etc..
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