I'm pretty much done with my project, It's an LS-Vtec in a 89 Civ 4-door. I've been getting conflicting reports on the wiring harness I need. Being that it's dual point fuel injection, I need a wiring harness from a Crx or Hatchback Si. Or can I modify my stock harness? Any help will be much appreciated.

 

You must rewire the stock DPFI harness to MPFI. The MPFI Si/HF engine harness will not plug into the shock tower cabin harness plugs because the MPFI plugs are different. You will need to get 4 injector clips for the style of injectors you are using and depending on the ECU you are using, you'll probably need an injector resistor box. If you are staying with OBD0 electronics then you will need the OBD0 injectors, resistor box, distributor and ECU.
I have done these types of conversions quite a few times and it's not as hard as it might seem. I just completed an MPFI swap in an 88 STD last weekend for a friend. Check this out for the instructions to convert to MPFI:

Kenji's DPFI to MPFI Wiring

 

Wow...thanks. The ecu is the stock pr4. That doesn't sound too bad. Much appreciated.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr. UnderHill &raquo;</TD></TR><TR><TD CLASS="quote">Wow...thanks. The ecu is the stock pr4. That doesn't sound too bad. Much appreciated.</TD></TR></TABLE>

You do realize that the PR4 is designed for a nonVTEC DOHC B18A1 motor. The ECU could be OBD0 (90-91) or OBD1 (92-93) also. If you now have an LSVTEC motor you will need to get another ECU such as an OBD0 PR3/PW0.

 

Yeah, I figured that. I know the pr3 comes out of the b16...what does the pwo come out of?