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SignUp Now!Thats something I never knew. Seems logical GM wouldn't wire every car for twilight sentinel, and the like.there are differnt harness for digital dash vs analog ,security and twilight ... those options and not wired into what i'd call the standard analog harness which can add in options like a/c, cruise , rr defog
thanks.. didn't even think to look on ebay..There are a few up on Ebay right now. Here is 1.... 1984-1987 Grand National Turbo Regal T-Type Dash Wire Harness Fuse Box | eBay