Its best to figure out what brand/kind of gauge it is- autometer, s/w, faria, etc. and get the sending unit that matches.

Napa had a S/W sending unit for mine.

Dan'l

I always say a 76 Ford F-350.


Sent from my iPhone using SoCal Jet Boats

Gauges use different Ohm ranges. 0-90 for GM, 240-33 for Stewart Warner and others, plus other ranges. Oil gauge max psi also matters. You need a part number off your sender or gauge to get the correct part.

The boat I just picked up has a GM sender with a Beede gauge so it reads incorrectly and pressure goes down with RPM. The sender is 0-90 and gauge is 240-33.