I have an assebly manual from a 71 and it does include a wiring diagram. Your best bet no matter what type of wiring you are planning on doing, is to gater a few manuals (hayes,chiltons,etc) and cross check the wiring diagrams of each one. Also you can buy a wiring diagram from your local resto shop. There are diagrams on ebay for sale as well.
”On page 12-71 of the 1972 Chevrolet Passenger Car Service manual there is a wiring diagram for "Instrument Panel" (Monte Carlo, Chevelle SS)”
The service is well worth the purchase price. Not only do you get electrical diagrams, you also get a load of other good info. However you will not find a wiring diagram for the optional gauge dash. I sure would like to find them for all years, 64-72 of course.
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