Small addition: Run gas tank to almost empty THEN remove the sending unit. With the wiring harness connected, manually raise and lower the float while someone watches the fuel guage. Still sits on "E": follow the 24" BLACK wire at the harness connection to where it is screwed to the floor pan. Clean the rust away from the sheet metal screw. Still sits on "E" when float is manually moved : Open up the sending unit ( carefully bent the tabs - tabs break off easily). Clean out the rust , clean the fine windings with 600 grit and the little contact that slides UP/DOWN the fine windings. Be careful- and do NOT bend the position of the little contact. Carefully re-assemble the sending unit , attach the harness and again manually move the float UP/DOWN. Fuel Guage still sits on "E": I'm sorry you gave it your best shot.
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