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You might search google for "gmc nav hacks" or something similar
I did some digging before and came across some links that said what re-wiring had to be done to make this work.
A few bucks of wire, some time, and you should be good to go.
I did some digging before and came across some links that said what re-wiring had to be done to make this work.
A few bucks of wire, some time, and you should be good to go.