dual point to multi-point motor swap

i am giving my crx si motor to my friend since i owe him some money and he wants me to help him swap it into his 89 (i think) hatch. the hatch is dual point fuel injection and the si motor is multi-point. i am looking to clear up some confusion on a couple parts before i get started so i can use some help.

engine wire harness (can i use the one from the hatch)
shift linkage (can i use the one from the hatch)
i have the ecu and other parts already but i was confused about these. also, do i need the part of the wire harness that goes through the firewall too or is the one in the hatch ok?

thanks.

This page will tell you everything you need to get/do to do the swap.

http://www.fourthgenhatch.com/mpfi.html

thanks.

if i buy another wiring harness do i also need the piece that goes through the firewall too? if i keep it, will i have to repin it?

just use the wiring harness from his DPFI motor and convert it to MPFI with the above directions.. that's the simplest way to do it :)