Rolando,
Not familiar with the D-Jetronic but know some about the Digital-P.
First, as far as I know, all 6CU and 16CU have the same pin configuration and any of them, as long it’s the right CR and Cat/No Cat type will work.
So if your DAC4478 is indeed working it will do the job fine.
No way of testing it though until everything is in place.
Two completely different things.
The Ignition Amp (GM Module): is what gives the trigger signal at the ECU.
The Power Resistors: the ECU has two states, Open and Hold
Open is the initial firing of the injectors, full voltage
Hold is through the Resistor Pack so the current is limited to protect them.
Don’t really know, but looks very different.
This must be an early configuration, and what I imagine it’s for:
When engine is cold (Oil Temp Switch) the Vacuum Changeover Switch kills the Vacuum Advance to waste heat and help light the Cats faster, and activates the Supplementary Air Valve to compensate the idle.
Later this was done with a timer, 45secs in some markets, 15min in others.
This is what you are aiming for:
Without 0² Sensors:
With 0² Sensors:
If you go to all that work, I would strongly suggest that you add O²Sensors (heated).
Big difference on economy and the engine will run much better.
.
Depends on your skills and patience.
Complicated, but at the end of the day it’s just cables, relays and sensors.
A replacement harness might be less complicated but I don’t know how easy it is to find one.
This article explains all the components in detail and if you have questions just ask.