Anyone with an OTC 4000E monitor?

I picked up one of these from a local swap meet for 5 bucks. Doesn't have anything with other than the GM cartridge that will work for me, but, it doesn't have the OBD1 cable.

If you happen to have one of these and the OBD1 cable, I am just looking to find out the pinout for that cable as I want to specifically use this on my truck.

Thanks!

Holy smokes! I haven't seen one of these in years. I stripped an OTC2000 years ago but I never bothered to get the pinout.

I suppose that I could just run a ground wire and a signal wire to pin E of the ALDL connector and try until I am successful in getting a data stream, or, something starts smoking...LOL.

I've got spare ECM's, but what I'll do first is open the thing up and see what the cables connect to. Maybe that will help isolate the input pins.