I thought they were Ohm meters. Anyway, I just Googled it to make sure,
and see a ton of pages on testing marine fuel sender resistance.
Wal
you wrote:
I agree with your diagnosis. It's gotta be reversed polarity...of the
sense and gnd. Fundamentally the fuel gages are just voltage meters. They
respond proportionally to the voltage drop across the variable resistance
in the sender. I would disconnect the leads and use an ohm meter to
measure and validate the resistance of the senders. Switching the polarity
of the sense and gnd monetarily probably won't break anything. Before
doing so validate that your wiring looks like the attached picture.
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