From what I have read so far I can't use the JDM engine harness, but I can use the stock si one. Also I have read that you have to use the civic injectors also. Can't I just wire in the connectors of the the JDM harness and run the integra injectors? I will be running a chipped p28 also.

 

Yes you can use the JDM engine harness. I am using it and it works. It'll reach (Barely).

 

you can use the si harness...you can just cut the connectors on the civic harness and rewire and solder the ones from the jdm motor, just follow the wiring colors.

 

I repeat you can use the JDM wiring harness. I have done this it will work.

 

Listen to the man, he knows what he is talking about.

 

I am doing the exact same thing. JDM ITR motor using the RHD harness (thanks to the advice of Apex i ITR ). The only thing that I couldnt get to reach was the white wire that goes from the alternator to the fuse box. So I just use the wire out of my cx harness.
Also, if you are running a rechipped P28 ecu, you will need a USDM vtec solenoid, because the JDM motor doesnt have the oil pressure switch.

I am running this set up w/ a kenji rechipped P28 and the motor runs strong.

Good luck