I'm looking for some input from anyone who has used Painless, American Autowire or Ron Francis wiring harnesses. I need to rewire my 68 Coupe. I have some mechanical experience, but not much electrical/wiring experience. I have a pretty stock setup (no aftermarket additions right now). Which is the easiest harness to install? Which one has the most prewired factory connectors (particularly under dash)? Thanks for the help.