i'm about to install a oo us b16a2 in my 95 cx, would it be easier to use the si harness and ecu,or convert my cx harness onto the si engine. need help asap

 

Use your stock harness. It might help to get some obd1 injectors, alternator and distributor to use with your stock harness...unless you want to cut and splice on the obd2 plugs.

 

seriously, dude.
How many times are you going to ask the exact same question??
https://honda-tech.com/zerothread?id=342332
https://honda-tech.com/zerothread?id=342584

Not trying to be a dick, but damn.

I think the easiest way to do it is:
Purchase an obd2 gsr or itr engine harness.
-It's probably going to be cheaper to buy a engine harness than to buy obd1 injectors, distributor, and alternator. Much easier too. Then you can still sell the si harness to make up for some of that money.

Purchase a rechipped p28 ecu
-Even if you alter your cx harness to fit the si motor, you still cant use that obd2 si ecu without purchasing a jumper harness. Again, you can sell the si ecu and get some of your money back.

If you do that, then all you need to do is add a few wires to your main harness (for vtec) and you are set.

 

I would suggest trading the injectors etc for obd1. I did the samething the other way around. Then sell the si harness. But getting an obd2 gsr or itr harness is a good suggestion. What ever is easier.