Any body know the correct ohm reading full and empty on a 64 f100 behind the seat tank. I don't see it in the shop manual I just bought. My gauge doesn't work but rises if I ground the wire off sending unit which makes me think its sending unit or float.
If it rises when yo grond it then the gage is working, and it is probably 90ohms empty 0 ohms full. I would start ith pulling the sending unit and check the float. Also when you pull it you can cycle the float mechanis and watch the gage to see if it working, then you will know if it is the sending unit or the float