My conversion to the Ford ISC is solely for use with MS. It will run off both the MS1 and MS2 processor but I expect it needs the Extra code at least with the early processor.
This will use the original Fidle output with the larger driver retrofitted. It is controlled with PWM.
Basically any code that will run the ford valve.
The air passengers are internal as are the original ISC.

The TPS info is from the FSM, the +5V power should be the Blue-red wire in your plug.
If you and Gen One think the FSM you have then this probably is also. The sun will be up in a few hours, I will go find a connector and look.
The three wires must all go to the MS connector, the ground can not go the engine or chassis. The harness you are using already has the wires all going to the ecu.

The original stepper should be about 100 ohm across it wired this way. To me step size is not important since this should be able to be setup when running.

I just bought a GM ISC, when it gets here I will see if it will retroft into a Mitsu housing.