My car is now running but fuel gauge always reads full
With the wire to the rear body harness-full
Grounded the rear harness connection-empty

Looked for a ground wire near backside of tank and did not see any ground wire anywhere.
Dropped the tank and it was half full
Now my question....
The sender and tank look new-ish
Even the wire that plugs into the top and goes to the rear harness is new
But no ground wire or sign of one Anywhere on sender
No broken tab, no nothing

Now every pic of a sender in a catalog has a ground wire..But I can't zoom in close enough to see where its at.

Can I add one? And if so where? Or do I have to get a new sender?

Thanks in advance...If I could post a pic of the sender with NO ground wire I would

This is a pic of the sender in my 69. If you save the pic and then zoom in on it, you can see the ground wire at the top right under the fuel lines.

Since you'll never see it, a small hose clamp over a wire stripped and wrapped around the fuel line will work fine.

I'm not sure you want to use a live fuel line to ground anything electrical. It just doesn't sound like a good idea to me. I'd run it out and use a self tapper into the side of the frame rail.