Quote Originally Posted by jff45 View Post
Not quite. What I’m suggesting is to read the boost that’s coming directly from the turbo to eliminate any issue with the wastegate.

On the turbo compressor housing there will be a barb where the boost pressure is sent to the entry side of your boost controller. Something like the brass barb on my P4x4:

B2A113E7-C7BC-4F64-9046-0675EFA1C7A1.jpeg

You need to take the hose from your IC, or wherever the boost gauge gets its reading, and connect it directly to that barb so the gauge reads the boost the turbo is making. You’ll almost certainly have to lengthen it to reach.
That should completely isolate your boost controller and the boost will have no effect on the actuator.
My Turbo doesn't have that barb as per pic.