For 190's, the engine harness for the 2.6L models from 1988 to 1993 are way different. I know they added lots of emission junk. Did the newer harness add more power? Better management maybe? I was just wondering guys because My 88 190 is in need of a new unit (engine-trans). 195k and the previous owners beat it into the ground. I am swapping from a 91. Should I go through all the work and switch the harness out? Which is best? Thanks.