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The only thing a vacuum gauge will tell you is if you have any restrictions in your intake tract that cause flow backup... and a flow meter will tell you better.
Diesels don't have throttle like gas engines do, so they don't generate vacuum unless there is some other form of restriction.
I see you're in MD - check york, lancaster, and harrisburg PA craigslists for a deal on 'Cedes right now... 3 of them for $1800 (I think they're all 190D's as well.)
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