90halfton
I'm Awesome
Yes, and you are probably right about the years.You're talking about the equivalent of the DRAC, right? From what I can see in this thread, only 88-91 trucks have the electronics built into the cluster. 92-95 have the external DRAC, 96+ is all computer controlled.
http://www.gmt400.com/threads/gm-drac-vssb.31169/