The blindingly obvious can itself be blinding! (anon)
EDIT:: Due to Copyright restriction, the image associated with this post has been deleted.
Yes, the stagnation point and compressibility associated with the Pram side also exist with the opposite sign on the Pvac side, but a properly designed tube will track equally the Pt ~ Ps difference, be it on the pressure or suction sides.
Nothing is new, and this idea came to me when examining the usage of a venturi variometer in high performance gliders.
mm43