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Red buttons tell the story...
Francisco,
Are you familiar with those two small red buttons on the lower section of your vacuum gage? When you start one engine the associated red button for that engine's vacuum system should disappear. Actually, if the vacuum source is working right the red button 'retracts' out of view and the gage should indicate the value listed in the limitations section of your POH. If by chance you start just one engine and both of the buttons disappear from view, that would suggest a defect in the vacuum manifold check valve which is located above the co-pilot rudder pedals. So, the easiest way to check the system is to start up either engine and look at the gage and the associated red button to see that it retracts out of view. Then shut down that engine and start the other, checking that the other red button retracts from view and you're getting the the proper value. Your Cessna Service Manual has a section on this in the utility/instruments section.
SkyKing
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