Fuel gauge works perfectly. Sending unit works perfectly. Wiring from the tank to the gauge works perfectly.
How do I know this? I connected the sending unit with alligator clips to the two wires at the tank before installing the sending unit in the tank. Dash gauge went up and down with the manual movement of the sending unit arm and float. Oh ya, float works perfectly , too. I submerged it in gasoline overnight to make sure it doesn't have holes in it.
Once installed in the tank, the gauge stays at Empty with no movement.
What do I need to do?