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If it is an EGR you will have a heat exchanger on the left side of the engine looking forward, with tubing coming from that around the top of the rear of the engine into the intake manifold.
The boost gauge will not show true boost because when the EGR kicks in under power the boost goes up to 50 PSI, but will only show about 30. I do not know how accurate the boost gauge is when it is reading turbo pressure without the EGR engaged.