Assembly manuals can give you some basic wiring diagrms, they are located in upc section 12. These diagrams are for base line models only and do not show wiring for options (like guages, tachometer,ect.). Additional wiring for AC can be found in upc section C60.If you know all of the options that you have, you may be able to find the harness part numbers in the assembly manual. If you have the part numbers, you may be able to get diagrams from Delphi Packard Electric(the company that made the harness),the number is 1-800-PACKARD (1-800-722-5273).I have not tried to get diagrams from them,so I don't know if they will "give" them out. You can also buy terminals and connectors from them, (you need to know the part numbers of the terminals or connectoers, so you may have to order a product handbook to find what you need). I hope this helps.