RICO's 85mm 3 3/8" tachometer is designed for use on any engine equipped with an alternator, and only requires a simple connection to the electrical system to measure engine RPM.
The common RPM ranges  0~4000RPM 0~8000RPM
Either diesel or gasoline can be used with the same style of tachomers below. https://www.rico-instrument.com/85mm-gauges/85mm-tachometer-8000rpm-hourmeter.html https://www.rico-instrument.com/85mm-gauges/85mm-tachometer-4000rpm-hourmeter.html Customer support: service@rico-instrument.com