My '60 SII SWB has been re-wired by a PO. It is much different than stock but very workable and thoughtfully done.

When the fuel gauge and the tank is near empty the needle jumps to full. I have the same sender unit on other cars but I've never experienced this before. I think the sender and gauge pre-date a voltage stabilizer, but perhaps that is what I need.

Any thoughts?

Tom Smith