I have a few 87-89 G-J body digital dashes and want to "bench test" them. I have the harness pigtails that I cut out of the dash before I scrapped the car to make this easier. I only have 90+ FSMs so I dont with the wiring diagrams:bang head. So who knows what wires I have to give 12V and ground for it to turn on so I know they work. O,NAJ.......