Im working tonight. Email me a picture of the of the plug that the test panel plugs into on the wiring harness. I will put you together a whole service panel, plug and play.
I just need to know what kind of plug is on it, I built the whole harness in my machine by hand so the plugs are different.
I forget what I put in mine, but I had a pot issue before replacing it. I had one laying around from radio shack, and it definitely didnt meet the same specs as the original, but it has been working fine.