The diagram is little or no help
the drawings in the manual I had for my 240 of little value
because they were so blurry
I tried importing your drawing into photoshop
and I don't see anything I can understand

You have two vacuum ports instead of one?
and a four pin connector instead of a three and a two?

OK you have given me some clues
I will dig around in the trunk of my '82 and see what I find

perhaps I will be able to find something similar and start taking voltage readings

does this thing draw from a vacuum reservoir?
Hmm.. I remember seeing all those egg crate things in the boneyard
I betcha there is at least one
but it might be hard to find

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69 220D not running
79 240D parts car
80 240D Beater runs everyday
81 300TD temp disabled cooling problem
82 300SD sweet