Both types of gauge must be hooked into boost pressure. A Mechanical one has a hose all the way up to the gauge. An electrical one has a sensor down in the engine bay ( still hooked into boost ) and a wire up to the gauge. Afraid you need a tap or a way to get into boost either way. The only true "no tap" option is a Scangauge or similar that plugs into the OBD port and uses the stock sensors in the car.
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