Curious to know if anyone can tell me what the black vacuum line that is behind my instrument cluster is for. This is on a 1984 2.2Ldiesel chassis, now converted to gas. The drivetrain is out and the speedo being upgraded to digital and I found a vacuum line, but there is no economy gauge. If you blow into it it comes out at the P/B booster
so its in the vacuum system. Why? All chassis from factory equipped but some not used?
Thanks for the insight.

TobiasMB
300SE, 300CE, 190/5.0

The diesel used a vacuum proportioning valve for trans control. The vacuum was vented through a black line into the dash area. it did this so it wouldn't pull moisture or other trash in from under the hood.

It wasn't hooked to anything.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician

Steve,
Thanks to the insight relating to the black vacuum line behind the instruments....it makes sense.
Tobias MB