Stop in for a cup of coffee

This is not OBD, has the connector under the hood, square 6 pin I think it is. Have to look and see what the tool is, takes a cartridge for the years?
Obd1
New is obd2
The snap on one had a variety of cartridges.
Lots of them had cartridges.
The best one for the old mopars was the drb. Really hard to find complete and kinday pricey.

and you could have pulled the codes by cycling key on/off 3 times. Count flashes and decode from there.