I thought of tee-ing off the actuator pipe but the vaccum pipe is hard plastic could it melt with heat from the turbo?
I've had boost guages on landrover tdi and vw tdi's. You are wanting to measure pressure actually going into engine. On the landrover I drilled and tapped the intake manifold and screwed in a fitting.
On the vw, I got a fitting that went in the intake pipe, just before the manifold.