Fuel Gauge question

Bimetal beam in gauge was arrow straight when new. Heat caused it to bow moving the needle. Overheat caused the bow to remain. Can't just straighten it out and expect it to respond correctly again. What was insulation on the nichrome wire is now ashes. Needle damaged also... You don't have a core worthy of rebuild. There should be a good used fuel gauge available somewhere.
I don't believe you will find a NOS fuel sending unit. Good hunting though. Pack plenty of coin just in case.
Aftermarket fuel sending units will show full and empty. All points in between will be wrong. Meter Match module will correct some of those midpoints.