Im goin to pick up a 91 hatch today its got a d16z6 sitting in it but it needs to be wired can anyone explain the v-tec wiring..........

 

If the hatch is si, you need a obd0-1 jumper if you are going to do it right. Then wire in the sensors that are labled on the harness. If its a dpfi hatch, you need a mpfi swap on the wiring.
http://www.rywire.com for all your needs.

If you are a do it yourselfer, simply mod the harness accordingly, and your set. http://www.droppedcrxsi.com might help out a lil.