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Ok so I swapped a d17a2 into my car after I spun a rod in my old stock block. I figured I throw a vtec in it cause that is what was available for cheap, and why not have slightly more hp...anyways I bought the ecu and wiring harness to find out that the harness has only one o2 sensor plug on it...on the ex the secondary 02 sensor Ives on the cabin harness I don't feel like finding one and tearing my dash apart just to have an o2 sensor, I've read where people have wired them in, but they don't say how...please help step by step would be great, thanks guys!!

 
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I'm missing 2 of mine and it runs fine... u could disable it in the ECU, or, use the pin out schematics to wire one in directly using two sets of wired off of your old harness..

 
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So cut out the wiring on my old harness for the secondary and match it up with the harness I have now? Will there be empty spaces on the harness plugs?(so it would be exactly like the a1 harness + the Vtec and egr plugs)?