Thread: W126 420SEL Vacuum Pump Stays On After Locking Doors
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Old 06-17-2006, 12:35 PM
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sixto sixto is offline
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Join Date: Jun 2000
Location: Eastern TN
Posts: 20,851
The MityVac I have has a rubber vent cap just in front of the gauge. Pull the vent cap to expose the port through which air is expelled when pulling a vacuum. I've used it to test a turbo boost gauge. IIRC it's good to 12-14 psi.

Sixto
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