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Moisture or ice in the vacuum tubing can cause this.
 

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Super Moderator
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Very likely, if you hear the turbo spool up fine, it's the gauge that's inaccurate. Mine jumped once briefly in cold weather. If the problem goes away as warmer weather comes, it was water/ice in the vacuum line.

You'd be amaze what a little moisture can do. Today's air brake have automatic moisture ejectors, but in the old days, you had to bleed out the moisture, or add alcohol to the lines. Once about 5 a.m., our fire engine was backing in the station in winter, and a tiny bit of ice formed in the brake line. The brakes suddenly seized and would not let go. They had to rev the motor and smoke the brake and clutch to get the truck inside where it could thaw.
 
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