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Understand that by reading boost thru the OBD port will be a "theoretical" boost reading.
It is reading the MAP, then subtracting Ambient Pressure from it to give you the remainder of what is left over.
If you want a gauge just so you have something to watch go up and down, and show relative pressure, it will suffice. If you want something accurate, you will need either a mechanical gauge or use a gauge with a sensor.
On my car the ambient pressure will change by 1lb or more just by the car moving (air pressure building at the front of the car) if you log it.
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