They're not factory diagrams. That's why it says Plymouth at the top. Its from some sort of book or series of books with various makes of cars.
Steve. I can't beleive you don't have '68 Shop manual. For '67, the diagram is in the Barrcuda supplement. Maybe they added it to later revisions of the Plymouth manual. its not in mine. The barracuda instrument panel wiring may be covered in the valiant diagram. Its some of the body wiring that is definately different on that.
Chrysler diagrams almost always have wires identified by circuit, then wire in the circuit or suubcircuit, followed by insulation color and size.
View attachment 1715475995
View attachment 1715475996
View attachment 1715475999
View attachment 1715476000