It combines pressure (turbo boost) and vacuum (from the vacuum pump via the vacuum control valve on the IP) to create a vacuum signal that mimics what the vacuum in a gasser's intake manifold looks like depending on load and throttle position. This allows Mercedes to build one tranny for both gassers and diesels. With a manual transmission you don't need the blue "flying saucer" and can remove it, carefully plugging the appropriate lines to prevent leaks.
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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