Re: What is the best harness for my car?
Search "painless" here, and you'll see plenty of opinions. From what I've read, the directions are lousy, you need to reuse OE terminals, and the tech support is not great. AAW Classic Update is definitely superior, and not a lot more money. If you advance search with "update" and my username, I have done some writeups on the install. Very easy, and lots of extra circuits like you're wanting. Top notch tech support too, and you can buy from one of their vendors (like Mike above) and get a great price.
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!