idle time with engine down
 

where is the best place for me to take vacuum reading from the upper intake manifold? I have it placed at the bottom of the plenum where the airflow would be the greatest, but I started thinking maybe this will underestimate the boost and overestimate vacuum from venturi effect. I'm also adding water injection so I thought to move it to place where it's not gravity dependent. Am I overthinking it? would just anywhere after the throttle blade be okay?