Well, Dave at Roseville took car of me and sent me a replacement unit....
Went to install it today and realized that I somehow misplaced the original locking ring, which seemed to fit better, and I also misplaced the first "new" one I had...LOL)...scrounged a while and found another new ring I had gotten with one of the Rock units and forgot to send back.... and installed the sending unit. I tested before hand....sweep seems ok, with a few spots where it jumps back and forth a little....then hooked up to the car but out of the tank..confirmed that at full up the gauge reads full and at full down it reads empty.
Also I didnt have to rebend anything to get the unit to seat properly like I did the first one....so off to a good start,,,,,
Just have to add some gas at some later date and see if it reads correctly.