Gas/oil press gauge inop

OOPS, somehow I read temp/oil press inop and thought the fuel gauge was working. Go to sender wire with a volt meter. Look for a low pulse voltage. If not present the limiter isn't working.
You dont have to open the fuel gauge to add on a outboard solid state regulator. Just lift the fuel gauge from the housing and isolate its backside from ground.
Add on doesn't have to be on the instrument panel either. Mount it anywhere you like with a little more wire. Take the switched 12 volt wire out of the round harness connector and route it to the add on. Done. 12 volts goes where it should, 5 volts can't go anywhere it shouldn't.