Answer
This is on your W123 1984 300D turbo.
Vacuum Diagrams W123 and W126 models
Vacuum Diagrams
That should be your Pressure Converter, #84 in the picture.
http://home.comcast.net/~phantoms/vacuum/engine2.jpg
Have a great day.
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1985 300SD
1983 300D
1984 190D
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