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Old 03-13-2012, 09:57 AM   #3
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Well there are two types of boost gauges. One that reads vacuum and boost and one that only reads boost. Both will read zero when the engine is off but where zero physically is on the dial face is not the same. The vacuum/boost zero will be approximately mid way between the ends of the needle sweep. The boost only gauge zero will be at the be at the beginning of the sweep of the pointer.
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