I think I would do a Hotwire harness to run the Hemi and leave the 98 computer to run the other stuff. The Hotwire harness is free standing. A 98 wouldn't be as bad as a 2002 or 2003, the later versions had more things the computer controlled. As late as 96 you could still separate out the engine control from the other things in a Dakota harness. It was a mess, but do-able. Gene