I haven't yet ordered my wiring harness partly because I'm still doing research on just what I want. I'd like an original style harness but with included turn signals and wires to the back for trailer lights and brake. This was not an option on my model truck but the COE wiring diagram does include most of these features.
In the next few weeks when I get some more literature/diagrams I'll do some comparisons and editing and come up with a mostly original harness diagram with correct/period color codes for the added features.
The wiring harness shop I will be using is
www.brillman.com just an hour or so up the road from me.
Grigg