where can i find a scanner for 85 gn

What ecm do you have ? 84/85 only TurboLink or an OTC 4000 will work. 86/87 take your pick Direct Scan, Data Logger, Scan Master, Turbo Link, OTC4000. Look in the Parts For Sale section of this board or Google their names. Some are better than others, do some searching in the forums and on the net for comparisons.
 
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