Re: 1977 Starcraft SUS 18' I/0 - Need interior help
see the link I attached for wiring of a fuel gauge
anyways, if you ran a black ground from the battery to the sender and split it off to the filler, that works as the connection maintains continuity, meaning both are connected to the ground
I had some funky original and hacked up wiring also, wierd colors, that is why a multimeter was needed to sort it out
look at the linked diagram, but in essence
pink wire from center of sender to fuel gauge "S"
black wire to NEG 12v battery post from sender cap, and pig to fuel cap
on your fuel gauge, follow the diagram, but you get switched power from the Ign which lights up the gauge.
I did NOT have switched power to anywhere on my original dash because the only 2 gauges were SPEEDO, which was pitot, and the fuel gauge according to prev owner never worked, and I fixed that.