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For dpfi cars considering a swap the first step is to convert the syst. to mpfi. Here's a general guide for doing it.

4G DX to ZC wiring conversion
by Kenji Plennert

In order to convert your dual point injection DX to multi-point injection you will need 4 injector plugs, an injector resistor box, extra wire, a wire stripper/cutter, heat shrink and/or electrical tape, and some patience. Also, when doing this conversion I would highly recommend soldering all connections and heat shrinking them. If you do not have access to heat shrink neatly wrapped electrical tape will do just fine. It is also extremely helpful to have an extra multi-point injection engine harness laying around to take plugs from (i.e. injector plugs, injector resistor box plug, and distributor plug). Listed below is a straightforward and easy to follow set of instructions to help you complete your DX to ZC swap:

Inside car at the ECU plug:
• Pins B10 and B12 are empty. Unused pins can be taken from B2 or B11. Some models have a wire located at B12.
• Cut orange and white wires off at C1 and C2 and connect them to wires added at B10 and B12. Orange-B10. White-B12. Leave enough wire for next step.
• Run wires from C1 and C2 (direct ECU connection) into the engine compartment. Label these wires for later use.
• Cut wires at A3 and A7 leaving plenty of wire. Run these wires into the engine compartment and label them for later use.

Outside car
• Transfer DX wiring harness over to ZC engine.
• TPS and EACV plugs are too short and must be extended.
• Be sure to switch green/white and yellow/white wires on TPS

Injectors and injector resistor box
• Connect the yellow/black wires from the two DX injector harnesses and run it to the yellow/black wire on the injector resistor box.
• Connect the yellow wire from the DX injector to the #1 injector (brown wire).
• Connect the red wire from the DX injector and run it to the #3 injector (blue wire).
• Connect the A3 wire to the #2 injector (red wire).
• Connect the A7 wire to the #4 injector (yellow wire).
• Connect the 4 red/black wires from injector resistor box to each injector.
Cylinder position sensor
• Connect C1 to blue/green wire on cylinder position sensor plug.
• Connect C2 to blue/yellow wire on cylinder position sensor plug.

That’s it. Double check everything and start it up. Good luck!