Zacharias, number 7. http://www.dieselbenz.info/images/vacuum_engine_pp.jpg

One hose goes to the head and another to the A.L.D.A..

My prior post disappeared so...

Sixto, thank you so very much for the thread, but you are right, all its links are dead... Will read Mr. Carlton's post on the transducer, as this mystery part is teed into the line going to it.

__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.