I need some fuel sending unit experts please

TrailBeast said
Just a FYI I haven’t seen mentioned is the nuts on the back of the cluster can and do loose their contact due to age and basically tarnishing.

I have fixed a lot of gauge failures just by loosening and re tightening the nuts.

I took steel wool and got rid of the tarnish and insured good connectivity throughout. That’s why I soldered the pins because one was not making contact.