The question I would ask is why would you need to rewire if the gauges previously worked and you didn't change those connections? I think you are on the right track with the PCB or the ground as those are more likely to impact all the gauges.
Well the short answer is I don't. I just hate the fact that someone didn't take the time to find a 12-pin connector that was correct for this application. So the wires you see coming out of are completely the wrong color. Thankfully I could see the wires coming out of the factory harness so I was able to make sense of it all. I'm also a little OCD with these kinds of things. So after I get it fixed I may change out the wires for the correct colors but since that would be a PITA, I'll prob wait till I can get the correct harnesses.
