Stutz Bearcat and/or Mercer Raceabout:

My 2003 Ram 1500 would at least give you the code. If I remember right, you had to turn the key off and on 3 times and then it would show in the digital cluster. It was handy as I had a recurring issue with an evap leak code being thrown due to a bad gas cap.

Friend of mine has a ‘04 Dodge Ram with this integrated into the instrument panel. Best. Feature. Ever.