So Im putting a d16y7 in my wifes 99 si (please dont bash its a long story)

I purchased a 99 dx harness from a guy on ebay came in good condition but im not sure where these plugs right here are for, I tried looking them in my service manual but it only shows connector types and wire color.





also i cannot remember what this one goes to as well ^

and as far as the 2 o2 sensor wiring goes, the si chassis 2nd o2 sensor is wired into the body harness, so how would i wire that correctly because I am going to use the original obd2a ecu (cannot remember the code for it have to look it up) with a conversion harness.

Thank you in advance!