On-Board Diagnostic systems are in cars and trucks built starting in the '70s and early 1980's. All cars built since January 1, 1996 have OBD-II systems,
"I had a high dollar scanner hooked to this truck"
This high dollar scanner was most likely a OBD-II scanner, they work really well if the "check/service engine light" is on...BUT not on a 92
with Chrysler you can turn the switch on and off or sometimes hold down a button on the dash to flash a code ,If the light on a Chevy was on, you could have used a short piece of wire in the diagnostic connector to flash a code on the dash, on a ford, there is a similar way of checking, but I tend to have less luck finding the problems, here is a link to the steps involved...
http://fordfuelinjection.com/?p=13
This is not my page, but a link I saved a while back when trying to solve the problem on an F150, it was a fuel problem, but the codes may point you in the direction you need to go, if problems arise in the future. Sorry I was not able to follow along and reply in time to of helped you with this.