Excellent, that answers my question. The Dawes controller opens up when you set it to do so. Then the waste gate sees the pressure and as long as you set the new controller to open at a higher pressure than the wastegate, it doesn't effect at which pressure it opens since the only pressure it will see is plenty high.

I figure I'll "T" into than manifold air line for the gauge and I'm good to go.

Frank.

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'82 300SD