Good points sixto.

I have the GP relay setup from the W201 car. I need to play around with it a bit to see if it can be wired directly to the fuse box, but the neutral safety switch is a good idea for a source of 12V.

I'm curious about bypassing the flying saucer. What kind of "damper" can be used for that purpose?

Idle control will be done mechanically, and the A/C won't be functional.

Also, I've always wondered what the electrical connection is on the front of the air filter box. What does this connection do?

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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver)
'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner