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I did just what you describe. Removed the sender and worked it manually to see if the gauge would follow. I got the same gauge movement as in the tank. I tried to move it past the stop to see if that was the issue. That's when I derailed the resistor, I took it apart and everything inside looked right. the point moves along the entire coil.
Right now I get about 2/3 of the movement I would expect. From just above E to about 5/8 a tank. The tank is very close to full.
It seems like it should work the sender is new. Why would the gauge move when the engine is reved up? That doesn't make sense to me.
I did add a ground wire from the sender flange to the cab (which is grounded to the frame). I also cleaned off the gauge contact to the gauge body and the body to the dash.
I just cna't figure it. Like I can't figure how the resistor doesn't ignite the fuel.
Rich
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