help! fuel gauge kind of works?

I have a pic of one possible cause here somewhere. There is a brass contact in the sender that slides on a resistor wire. After 40 years of wear what was a stamped spot becomes a fish hook of sorts. It will catch the resistor wire and stay caught right there.
Other common cause is a saturated float. Those get a tiny hole in them and fill with gas.
In either case the sender is not functioning. The gauge is working exactly like it should,
2 needle positions, home, empty.