The knock sensor is the wire that comes out from underneath the lower intake manifold.  The sensor itself is screwed into the block in the valley between the heads.  If/when you swap engines, replace the knock sensor.  Its like $30, and it really sucks to put the engine all the way in, and find out you're geting a knock code, when nothing is really wrong.  When you get the knock sensor, just get the one for the '95, it'll thread into the block no problem. 

IIRC, I had a couple of other wiring connections that weren't quite right, but I just cut and spliced connectors from either the donor harness, or off the components I was replacing from my truck ('91)  I also put in an '88 v6.