Magnum wiring help

I should also add that if you plan to keep the engine completely stock, the factory OBD1 PCM is fine. If you plan to do any upgrades, consider getting a PCM and engine wiring harness from a truck in the junkyard, and then make sure you get the VIN from the truck that PCM came out of. Now you can setup your car with a PCM that can be SCT tuned for your upgrades. The OBD2 PCM and harness can be used to run the older OBD1 engine, just by setting it up as an OBD2 sensor arrangement, which is basically the same. The engine does not care what runs it.