Ok guys this is what I got,91 STD hatch with which all love dual port inj. My question is this, I also have a 91 crx si that is basically a parts car for now, can I use that harness from the crx on the hatch for muti port inj. when I do my B series swap, or should I just go ahead and buy a rywire harness for the swap? This will be my first swap so just tryin to make sure it's right and not try to spend money i don't need to. If anyone needs to know I'm puttin LS/VTEC swap, b18 a1 block and b16 a1 head,I know its ol sckool. One more thing can I stay OBD0 are should I go ODB1? Thanx guys for your input.

 

use the engine harness that came on the car and modify it as required for DPFI to MPFI plus VTEC - you can rob the injector wiring, distributor plug, etc. from the Si engine harness when making the wiring changes

 

I STRONGLY recommend converting to obd1 after you've done the dpfi>mpfi swap for tuning ease.

 

Easiest would to be just convert your std to MPFI, but you could swap the complete harness from the Si. Complete meaning everything from front to rear. It would be a lot more work than just using your stock harness and adding a few wires. Also I second that you should convert to OBD1. It will be much easier to tune your swap.