Sending unit leak - gasket question

Figured it out, the edges of the old locking ring are bent up, creating a pressure on the gasket when you tap it into place. The new locking ring is flat, so it doesn't really seal anything. I used the old locking ring with the new gasket, and no more leak.

Gas gauge still doesn't work though.. New tank, sending unit, lines, ground strap, and voltage regulator. Damn gauge still doesn't work.