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There is an 1/8" NPT plug on top of the intake manifold adapter where the boost gauge can be plumbed into.

This image shows my pyro/boost instument "pod". The thermocouple is installed in the exhaust manifold BEFORE the turbo. You can install it downstream of it too, but the temp will be about 300 deg lower and the response time longer. Thermocouple type instruments do not usually need external power...