I have searched and haven't really found anything that helps me in my situation. I just bought a 91 civic hatch that I panned to swap with the engine that is currently in my daily. I would have a little more than a week to get it done, so I am nervous about the wiring. I find a lot of people saying to convert both the engine and car to OBD1, but the only harness I have is the one of out my 98 gsr which I run the engine on now with an OBD1 ecu converstion harness. Has anyone done something like this? I see B swapped EF's all the time, but I can't find a thread on the wiring. I have everything else I need for the swap: trans, axles, half shaft, mounts, shift linkage, etc. At first I thought it was a crazy idea, but would it be easier to strip the Integra of ALL of its wiring and use it? I'm talking dash, speakers, tail lights, headlights, engine harness, everything, or at least what I would need to make the plugs at the shock tower work.

 

To take some confusion out of it, you need to apply your stock engine harness to the new engine.
You may need to change out some of the connectors to fit the OBD2 parts, but you will not use the entire OBD2 engine harness.

 

So I am going to need to buy an 88-91 civic engine harness and run an OBD1 distributor (because I am running an OBD1 ecu and there won't be a crank position sensor on the OBD0 harness), convert the distributor plug on the harness to OBD1, remove the resistor box, add vtec and the oil pressure switch, and convert the injector and alternator plugs? Are the TPS, MAP, AIT, etc all plug and play? I know the O2 sensors are different, but I run a wideband and don't use them anyways, so that won't be a problem. Will I need to do any more wiring than that?

 

Not just any 88~91, but a 90/91 for the chassis model (DX, Si, LX EX, ...) that you have.
88 and 89 are different as far as I remember.
Models that came with a MPFI engine will not be able to plug in at the firewall with a DPFI engine harness.

You haven't said what model your car is. This makes a difference because if the the stock engine was DPFI, you will need to do the DPFI to MPFI conversion.
Part of DPFI to MPFI have to repin the TPS connector. (DPFI rotates backwards so you flip a couple wires)
If your OBD2 motor comes with a distributor, you can use that instead of buying an OBD1 version.

Other than that, seems like you got it covered.