I pulled the sensor last night. Took it into my workshop. There was some corrosion around the shaft but not bad.
It had free play and is spring loaded to keep it against the engine as it moves. I put my meter on it and it read a nice smooth varying resistance as I moved it. So it seems to be OK (if that is how it functions). My guess is that it varies the voltage to the gauge as it moves, Putting a meter at the gauge did not help me. But if the sensor is good, I can move further up the line.
I might just buy a new gauge and try it. I think they are short money (less than 20 $).
Thanks, and I will also check all grounds when I re-install it.
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