DionR, seems that everything changed around 95-96. 95 was still obd1 and 96 went to obd2. transmission's went from 3 wire in 95 to 8 wire in 96 up. i think 97 or 98 was not return hose on rail.
Seems right. I know the '96 OBD2 setup isn't the same as the '97+ OBD2 setup as well, at least for a Dakota.
The other hang up for me is I dropped a 5.9 under the '92 Dakota 5.2 wiring harness. So I wanted a 5.9 PCM to match and found one out of a 1995 full size van. That van used a returnless system, so that's what I matched including the injectors. I think the full size trucks used a different fuel system than the Dakota's, but it's been awhile. The trucks might all be returnless while the Dakota didn't go returnless until '96? Not sure.
I was more versed on this stuff when I was planning a SMPI swap on to my '74 and working on the SMPI swap into my '91 Dakota, but now that I am building a G3 swapped Duster I sold my harness and PCM and have forgotten a lot of it.