i put a new silicon hose on from the plenum to the bov, with a new T-piece just before the bov, running to gauge B. all very secure, i cant imagine there's any leaks in the line.
gauge B is still reading 1 psi lower. tonight is a cold night, so i got 10psi on A, and 9psi on B.
the bov itself is bolted up well.
what bothers me is that there might be a pressure leak somewhere, hence the readings.
will adjusting the spring on the bov, to a harder setting, make a difference?
any others ideas of what to try, or where to look?