got the whole mpfi engine harness.

Im doing the mpfi swap and today i picked up a 91 si engine harness what do i need to do to that harness or what else do i need to do wiring wise to do the swap and do i need the new dizzy? i know i need the new ecu and i think thats all i need correct me if im wrong

you need the si dizzy.

the harness should be no problem to just switch out?

you actually modify your dx harness to be mpfi. the si harness doesnt just plug right in.

i used a CRX Si harness in my dual point car. two interconnect plugs plug in outta the whole thing. what i did was cut off the body harness from the Si, and took the engine harness too. then using that, and the harness in my car, i made a subharness. basically all i did was match up all the matching colors, and then looked on a buncha different wiring diagrams until i came up with an adequate subharness that connects all the mismatching plugs from the SI harness and the dual point harness. still hadda run a hasport subharness for my b16 though.....but all in all i think that it came out a lot cleaner making a subharness, even though now i do have to unplug 6 interconnect plugs to take my engine out.