I have an Auto Xray unit that does not seem to work (currently, I am talking with the manufacturer about it).
As for the one you meantioned, something is not right there: scanners for GM vehicles fall into these categories: OBD1 - 82 to 95 and OBD2 - 96 and on. If the scanner does 94 and on, then it should do 82 to present (unless there is something written into the software that prevents pre-94 cars to be scanned, which would be stupid as it is bascially the same setup as the 94/95s). I am not sure if the cables are different between the OBD1 and 2s.
Tim