Dont buy the harness its a waste of money...
Wire the VTEC solenoid to A8 on your ecu just cut the wire leading into it and splice it in.
The oil pressure switch goes to B5 so the same with this.
The ground you can simply wire to the thermostat housing or any other grounding point.
The second o2 is C8 i believe and if you want to wire the knock sensor i believe that is B19.
Hope this helps you can go to yahoo and search b16a wiring and you should be able to find a diagram....