Dx to zc wiring

What you will need:
Any Honda, 88-96 Injector Resister Box will work
88-91 SI ECU
88-89 5 speed Teg ECU
ZC ECU
Various colors of 16 gauge wire(or one color, that makes no difference)
Harnesses from junkyard that plug in ECU for extra pins.

If you are doing this yourself, I am pretty sure you know where the ECU is located, but if you dont, its on the passenger floorboard under the carpet.

Plugs at the ECU:
A1 A2 A3 A4 A5 A6 A7 A8 A9
A10 A11 A12 A13 A14 A15 A16 A17 A18

B1 B2 B3 B4 B5 B6 B7 B8 B9 B10
B11 B12 B13 B14 B15 B16 B17 B18 B19 B20

C21 C22 C23 C24 C25 C26 C27 C28
C29 C30 C31 C32 C33 C34 C35 C36

ECU Harness:
Now go into the car, and unplug the old ECU. Leave the harnesses there, no need to plug them into the new ECU yet.

Look at connector B(the middle connector), look at pins B15 and B16, some models have pins located a B16, if so, it saves you a step, if not then just disregard this sentence.
Now notice that there are the little white clips, one on top, and one on bottom. On the bottom one, clip that white clip out. I used 2 small screw drivers, one for each side, pushed the sides in, and it popped right up. Now get the harnesses you got from the junkyard, and pull 2 of the wires out. Add those 2 wires you pulled out, with the pins, and put them in the harness at B15 and B16. Put that white pin back on.

Look at Connector C now. Look at C21(orange) and C29(white). Now leave about 3 inches from the harness on each of the pins, and cut the wires. Now move the orange wire you cut, to B15 and move the white wire you cut to B16.

Now add enough wire to C21 and C29, to run to the Cylinder Position Sensor in the engine bay. Mark these wires down on paper(like C21 - Red wire, C29 - Black wire, or what not).

Now go to connector A, the biggest connector. Cut wires A2 and A4 at about 4 inches up. Run wires from A2 to A4 into the engine bay, they will go to the fuel injectors.

Under the Hood part:
Now how I did it was just ran the wires from the ECU straight to where they went, through no harnesses. So once you pull the motor out of your DX, switch all the wires over to your ZC motor. There will be one plug on the back of the intake manifold you do not use. I just hung it back there.

Now on the throttle position sensor, you will have three wires. Cut the green/white wire, and yellow/white wire. Connect the green/whtie wire to the yellow/white and the yellow/white with the green/white wire. The reason you do this is the SI/ZC TPS turns the opposite direction. Most places say you need to extend the EACV 5 inches, but I never had to do that, so if it comes down to you not making that, I suggest you add 5 inches.

Now what you do is you take the injector reisster box and you hook it up to the individual injectors.
Run the yellow wire off the DX harness to the #1 injector(brown wire)
Run the red wire off the DX harness to the #3 injector(blue wire)
Run the wire you installed at A2 to the #2 injector(red wire)
Run the wire you installed at A4 to the #4 injector(yellow wire)

Now the two wires that were connected to the DX injectors that are extra, coming off the harness, 2 yellow/black ones, connect them together and run them to the yellow/black wire on the injector resister box.

Run the 4 red wires off the injector box to the other 4 wires off the injectors, no particular way.

Lastly, connect C21 to the blue/green wire on the Cylinder Position Sensor, and connect C29 to the blue/yellow wire on the Cylinder Position sensor.

All I can say is that it took me like 45 minutes to do this all, and it was not hard. Just have some patience. The hard part is getting the white clip out of the harness. If you can get that out easily your set. I hope this helps out.