where should the reference for actuator control
come from?
i.e from near the throttle / inlet plenum or
from as close to the turbo outlet as poss?
i've always had unstable boost and as my boost
is starting to get higher the unstable boost is more
prominent and annoying.

 

on your cavelier think it is done by the pressure in the inlet manifold

 

my setup is vastly different from std,
not using vx turbo or ecu or map sensor
or boost control all aftermarket stuff

 

oh in that case can u not run it off a amel valve which is linked to the actuator and compreesor housing and wired into the ecu?