Many year ago I upgraded my '84 computer to a later (faster) 1990 TBI truck computer to complement extensive mechanical upgrades. This required re-wiring the plug to the computer. In tracing some wiring to the computer, I removed the computer, and in the process, one wire backed out of the plug and I didn't see which pin in the plug it came from. I traced the wire (purple) back to the MAP sensor, so it's the MAP sensor wire. I need to find which position in the plug it goes to. The computer came from Turbo City, which is now out of business, but the info on the computer identifies it with the following information. Year=1990, model=GM, 3rd vin #=C, 8th vin #=K, 10th vin=L. Can anyone help find the position where the MAP wire goes, or identify the GM model the computer is from so I can find a correct wiring diagram?