Detroit:
The compressor on that Powerstroke is mounted above the passenger side valve cover - right on top of the engine.

Yes, a rear port head is needed for that install.

While refurbishing a dryer could be done, generally this is an expensive route reserved to 100 point cars. The switches in your picture would appear to be wired in series with the jumper wire that crosses the top of the dryer. If the green switch has more than one wire however it may have other func...

Switches could be for many things, you need to look at the wiring diagram for the car. As I recall those Alfas had electric fans, so one switch may run the fan above a certain pressure. There are switches with dual functions called Trinary switches available. This may let you use a single switch ins...

EV Guy, you have more patience than I. And that BCM put up a hell of a fight.

Round two should be very educational. Thanks for sharing all of that.

So how does the bread truck motor work out in the Dakota?

So it pops at 30 psi. No air comes out of the compressor suction end that you have open to atmosphere until 30 psi right?

Back to basics.

Customer complains that it "stops"

Check the clutch gap. Very possible it stops cooling on a hot restart with a bad clutch gap.

Check the gap. If it is out of spec, correct it. It needs to be right anyway.

Have you provided some sort of Tach signal to the ECU?

So what pressure does it hold at?

Well a 20% oil overcharge is not good.

If the system was designed for 5 ounces, the 6th ounce is 20%.

500cc's of oil is max charge on the pump. You would fill the compressor and run the system, checking the sight gauge on the compressor to see if it needed any additional oil. Probably be close to full on the gauge. The compressor manual also says that if you remove & replace the same compressor ...