Suitable for diesel engine 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. B07RN3HJ72 or B07RR8NQ45
It shows rpm and hour. Hourmeter cannot be reset.
Red Backlight,1 year Warranty, 100% Waterproof and anti-fogging protection