Sending unit gasket placement

I'll try to take one it will be hard to see inside the tank tho.
With the gasket thickness here is the thing I can't get the locking ring tight enough as it is a thinner gasket and it will never seal.
A lot of people had that problem, me included. I just made my own gasket out of cork material, smeared each side with gas resistant sealer and let it near dry, and assemble.
Been holding up well for well over a decade.
It`s junk we have to deal with these days.