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Vacuum is negative pressure, boost is positive pressure. I own a 2011 Fiesta and saw your introduction posting. My 2011 is a 1.6 with the powershift auto 6 speed. I was wondering what engine you got in your 2014?
I have used a vacuum gauge in a previous vehicle. Have you considered a scan gauge? It would give you much more information.
Just a thought.
regards
Mech
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