The fuel tank cleaned up and looking good. Just needs new paint. Even the internals look very good, no rust. I had the intention to re-seal the inside of the fuel tank, but it is so clean that it won’t be necessary.
The fuel tank sender is looking less good. Resistance is jumping around when moving the float and does not de- or increase fluently (which explains the bouncing around of the fuel gauge). The resistance has to be in between 5-10 Ohm (empty) and 180-205 Ohm (full). Think I’m just going to put a new one in, they are not that expensive.