im not sure if this belongs here but i figured somone from this section would know best

ok i have evrything i need to do this.(full 92 donor car 3.1 v6 auto).the car im doing the swap in is my 89 rs.the reason being is cause i run a turbo,and have some driveability problems with the maf sytem.what i have out of the donor car is the full engine harness/and ecm.
is this swap as simple as swaping out the sensors/harness and ecm.
what about the vss sensor?my 89 has a cable driven speedo witht he vss sensor on the back,do i need to swap to the later trans with the elctronic speedo,or can i leave my cable driven speedo in the car and use that without any modifications.which im hoping i can do,if not can i just repin the connector to the ecm,and if so can somone tell me which pins i have to move?

thanx in advance