only VX (E-VTEC) and Si (single cam VTEC) models came with the VTEC plug on the harness. Here are the P72 GS-R pins you'll need to know (P72, which is the one that came with your motor. the letter/numbers P72 should be on the side, by the barcode, second row, bottom some where after a three digit #)
The connector slots are A,B,D. Identified by looking at the top of the computer, far left is A, then B, then D. Odd numbers on top, evens on bottom.
The pin for VTEC is A04 which is the A series connector, bottom row, one from the left. Odds on top, evens on bottom.
You'll need to ground the dark wire on the IAB, and run the Pink/Blue wire to pin A17 on the ECM.
Next, knock, which I believe is only one wire and a ground again, but may be wrong...at any rate, the pin for the knock sensor is D3.
As far as the 02 sensor goes, don't go cheap. Buy an 02 sensor for the maker of car OR ECM, both will work. You can stick with the DX sensor. the 4 wire is heated for the newer GS-R emissions, but you'll be fine.
E-mail me if you need anymore help.
LoveMyBSeries@aol.com
-Brian P.S. GOOD LUCK!