Think I found a fix for this. There's an o-ring seal on the gauge. Put a new one on. Went out and beat it around trying to make it seep/leak and it seems to be holding. There's a little residual fuel where the o-ring is, but the top of the tank used to be covered with fuel before replacing it. Cheap fix since I had the o-ring and no risk of sealant falling into the tank and getting in the carb.
