basically, ditto.
Your engine creates vacuum when it's running, and that vacuum is an excellent diagnostic tool, which justifies getting a vacuum gauge. When you install a forced induction system (blower or turbo), the vacuum is overcome by the boost from the blower/turbo, and now you need a boost gauge. Without a blower or a turbo, a boost gauge is nothing more than a 11k tach is to a stock Civic.
Take care,
~Chris
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