It is the only wire coming off the sending unit (that I can see anyway). The way it is tied around the line rather than just grounded is what made me think it was the gauge wire (I have found many wires just taped to things, tied to things or simply hanging since I bought the car and have been trying to bring it back to life - best example was a wire running along the intake and just taped to the hose running from the carb to the valve covers, still have to figure out what this is, its heavier gauge, maybe the AC power wire).
Since posting this, I have read that the power/gauge wire drops down from the rear harness and this should be the ground wire, this is based on info from a full size Pontiac, but I assume that most full size GM cars are similar. If this is wrong, I would appreciate any info. I am going to try it as was recommended by Deadwolf. Hopefully one more thing to cross off the list of things that need to be done - which seems to actually increase as I dig in rather than grow shorter.
Its amazing what I have found as I am trying to get the car able to run as I just lost my garage space and have to find another. Good times.
Last edited by miterry; 05-27-2018 at 02:11 PM.
Reason: updated information.