Hi Alvin.....I used an 18 Cct. Painless Universal truck harness in my '40. I picked it up on E Bay for a good price. I think 12 Cct might be a little tight if you start adding lots of accessories. I found the Painless Tech guys really good to deal with when I got stuck. I can't recall what you are doing motor-wise on your panel, but Painless has all sorts of add-on modules for injection, fans, etc.
