Plug-and-Play Wiring Harness

I like the M&H harnesses because they really are direct copies. If you are not a skilled electrical guy, I think they are the way to go. They are pricey though.

If you have some reasonable electrical skill and a lot of time on your hands, you can improvise and do it pretty cheap. Buy a cheap set of connector removal pins on Amazon. You need some connectors to practice on, maybe some junkyard harness. Once you get the hang of taking the wires & pins out of connectors, it is pretty easy. Just take pictures of everything and label all of it.

Remember, most connectors, like the firewall bulkhead are made for production line assembly. You don’t need them if you are doing point to point wiring.