Fuel Gauge not working

CRUZE 418 said
His fuel tank may not be a rusted mess, leaded fuel from back then seems to coat them. Unless it was full of water. Only a look will tell.

I think I'm "probably" okay with that or at least I hope so. The car had been sitting for about 40 years but always indoors in attached garages with no rusting on the body, frame etc. That doesn't mean there wasn't water in the tank though. Even the tank looks good on the outside anyway. Crossing my fingers