Your dash has a printed circuit on the back--no wires to hook up. You will have to change the wires around in the plug-in. Here is how:
http://www.gmcpauls.com/Tech%20Tips1.htm (scroll down)
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56 Chevy Bel-Air 2dr. HT (purchased new)
71 Chevy Cheyenne SWB PU (502HO)
65 GMC short bed step--work in progress and my gofer
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