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You can find a wiring diagram for a VS Commodore Dash inside the owner's manual. You can also check with local auto part stores.
go to offroaders.com/tech/images/CJ-Wiring-Diagram-1978-key.jpg
The 1979 Chevrolet distributor to the dashboard wiring diagram can be obtained from most Chevrolet dealerships. The wiring diagram can also be found at many auto-parts stores.
wiring on aftermarket dash mounted ignition switch
Buy A book.
no dash light
call year one and see if they have a book on it.
dash lights don't work, but the fues is good.
The 1990 through 1992 Cadillac dashboard wiring diagram can be obtained from most Cadillac dealerships. The diagram can also be found at most auto-parts stores.
Start with the headlamp switch.
Go to the library and get a Chilton's Repair Manual for your year Plymouth.
It will be in the fuse box maybe under some other name which is on that circuit. Get a wiring diagram from MOTORLIT.COM and it will show what fuse the horn is on. The fuse is hidden in the center of the dash above the radio. There are three fuses and the horn relay is next to these fuses.