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technically, you should see near zero vacuum on wide open throttle on a NA engine. The reason there is vacuum is because the throttle plate is not allowing all the air the cylinders want to be allowed in.
Same is true with a supercharged engine, if your throttle plate isn't open significantly, it should be under some sort of vacuum....this is all assuming your boost gauge is AFTER the throttle plate (which is where it should be).
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