I installed a d16z6 a few months back with the help of H-T ... thanks once again but i have been using my stock CX harness and stock ECU. I manage to get a hold of a manual p28 and finally a harness this weekend. Found harness at a junkyard for 50 buck. the problem is it was off of an automatic so the are extra connectors on the harnes but the needed o2sensor is there and vtec solenoid is there. my question is can i use the automatic harness. i have a 92 civic so i was hoping i could just install this harness and change to the p28 and it's instant vtec. let me know if i can do that or if i will need more wiring near the ecu to get it all working... well i will stop rambling now but i just luv the honda stuff ... LOL.
PS- I did the swap all by myself in one day ....

 

Since you have a 92 and it's prewired for VTEC on the cabin harness side, using the VTEC harness and the P28 ECU should make it plug and play with no additional wiring. I'm guessing you bought an EX harness since you said it was from an automatic but it will work just the same.