Builder tip...

For those of you with vacuum driven instruments listen up.
Before you permanently locate your vacuum regulator and bury it
behind the panel, take the time to test it on the bench when connected to the panel guage.
Turns out it is adjustable so you can set the vacuum for the instrument pointer to be in the
middle of the green range.
In my case, the pointer is just below the green arc so will need to be adjusted upward.
At this point, no way to get to it without removing the canopy.

Angier Ames
N4ZQ