Gas gauge not working. 1966 Barracuda

kewen300 said

1966 Barracuda, I loaded the car up on my trailer to bring it home. The fuel gauge worked when I loaded it up. I unload at my home the needle pegs to the full then fell right out past E. The temp sensor guage is working as normal. I picked up a new fuel sending unit as im going to put a new tank in this winter. I plugged the new sending unit in and grounded the fuel tube to the body. I still have no movement on the needle.

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I may be assuming a few things here, but it sounds to me like the sender wire got pinched when you strapped her down to the trailer.
That would cause the needle to peg to full, with the wire finally giving up and the reading dropped to E. This would also cause the new sender to not register when you plugged it in and grounded it to the body (you DID move the float to confirm that it wasn't just resting on "E", right?). Simple to check, just check the wire from dash to rear (unhooked) with a continuity tester or ohmmeter.
By the way, use your original sender if at all possible. New replacements are known to be very inaccurate. Do a "search" of that topic on this forum, it's been pretty well documented.