Well.. the ECU, and wiring are going to have to totally come out. and get ALLLLL taken apart. Major job ahead of you there. I think I had my vortec harnesses down to about 50-60 hours or labor. I would advise totally gutting the montero engine wiring and ECU, and going totally GM in that department.

Get ready for a notebook, multimeter, and lots of time sitting on the floor in your shop/living room/bedroom with that harness. <img src="/forums/images/graemlins/kewl.gif" alt="" />

87 Raider 4D56td v5MT1
31's..Basically Stock