Unless you secure it in place (epoxy or some attachment), this looks like a one shot deal; once it is on you won't be able to pull the sender later without dropping the ring into the tank...
I'm not a big fan of epoxy drooling into fuel tanks. Maybe add one or two very small flush screws through the tank into additional threaded holes in the ring? That way you can mount the ring first, the gasket would still seal and you may not cuss as much later. Still use a wire while you are doing it though. Be very careful about using a shop vac to pull the cuttings away, they make excellent ignition sources - don't ask how I know that...
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