Yeah that makes sense. That almost surely was the cause of my strange issue. I just didn't properly route or twist the wires since I added them in to this truck having never had them, wanted to make sure it worked first, before I twisted and routed them up and away. But as things like this go, you move on to sorting out the next issue and forget about stuff.




On the goofy speedo,
I think part of it is just how notoriously inaccurate the GM gauges are. The oil pressure gauge in this particular truck was reading very low, figured it must be the sending unit so I replaced it. Still reads way low..... I just installed a mechanical oil pressure gauge and ignore the stock one. Stock one tells me 0PSI hot idle and mechanical gauge tells me 37.5 PSI hot idle.