Ian, I agree. I modified the stock 6.0 harness with the help of various web sites, Youtube videos, and genuine GM/Chevy service manuals with the wiring diagrams and all other pertinent info needed for such a task. While doing the swap, I swore to myself a few times that I would never do it again. After completing it, and finding out how much it was worth it, I would do it again, although there would be some things I would do differently. Live and Learn!!!