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Hg " is vacuum you will see this at idle and off throttle. Anywhere from 14-20"hg, depending on your porting. Positive pressure will start as soon as you step on the gas and the turbo begins spooling. For stock twins you should see 10psi by like 2k rpms with a small dip to 8 psi at 4k rpms and then right back to 10 psi. Single turbos will just depend on their size. Some gauges read in bar, in which case you will have to convert my psi measurements.
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