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as long as you have the harness that comes with the engine (p28) EX or SI. you don't have to add anything. It could be that he is using the stock CX harness and had to add the wires for the o2. Or he's using a VX harness, has vtec wires but might be 1 wire o2 I'm guessing, didn't get to see a VX model yet. I'm not sure if other model years after 92 didn't come with all the wires hooked up. Possible only the canadian cars were. When I first converted my 92 CX to DX I changed the harness to DX and added a 4 wire 02 and also used a DX comp. all pluged in with no problem and no check engine light. My CX has a 2000 Y8 head bolted to a 95 Z6 block. with turbo. Using a P28 comp and (P28) Ex engine harness. NO check engine light and no added wires.