I know the simple circuit from the 'plus' side of the gauge to the 'negative' side of the sending unit pretty well but nothing about the gauge itself...could it be wired backwards?
That's the only thing I can think of that might make it move towards 'empty' as the sender moves up. I really don't know if it looks at current direction or not though. Mr. Serio would know that I'm sure.
Resistance should increase as the float moves up and that should cause the gauge to move towards 'F'. Yours seems to be moving in the opposite direction.
Yes, a digital volt/ohm meter is needed.
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Greg Reid
Palmetto, Georgia
 
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