Well, this one isn’t the one and I’ll move forward with operation upgrade, though probably take a while.
I took a closer look today including removing the tank. It’s rougher than I thought. Tank isn’t well sealed though it doesn’t leak unless it’s tipped. It appears to be running without the low oil switch connected. At least what I’m pretty sure is the low oil switch. Looks like the oil pressure sensor on my Jeep screwed into the bottom of the engine. Not sure how that works but the seller told me it was recently replaced but it hasn’t been touched for a long time and the wires were disconnected. Pretty rusty.
Overall seems like it’s in poor enough shape that it’s probably better to just enjoy taking the whole thing apart to see how it works rather than trust it not to cause a fire.
Sometimes things work out great, sometimes not so much. Still not out too much out of pocket and I learned some about generators.