You will need a new harness, ECU and some other things like the igniter, the dash is different too. There is a turbo guage in there and the tach is different internally. There are other things you will need to mod.
I havn't done this mod but while on vacation in Arizona last month I got the harnes, ECU, igniter and other little things attatched to the harness for the price of the harness. I had it all rolled up and they didn't notice the igniter so only charged me for the harness with ECU. Now I just need the motor and tranny.
One link here for items needed.
http://4cefed.com/conversion.html