I bored 2 holes in my oil pan for the Milodon swivel pickup installation. The Milodon kit comes with 2 washers and 2 rubber o-rings to seal the pickup to pan on the inside.

How tight should the -12 AN fitting backing nut be tightened to squish the rubber o-ring?

Do I need additional sealant or does the o-ring do the job?

Thanks, Chip