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Vacuum gauges are good for detecting failed valves. On a gasser they flutter with the inconsistency in vacuum that a bad valve causes. I once bent a pushrod on a Ford straight six and the vacuum gauge picked it up right away.
In this particular instance, I think the vacuum gauge is a great tool for keeping a permanent diagnostic eye on the vacuum system. You'll know your engine is not going to shut off before it actually doesn't shut off.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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