Welcome to the forum!
Your description sounds like there might not be any boost getting to the alda. I would check the line that goes from the back of the intake manifold to the overboost switch and from there to the alda for connections and/or obstructions.
Are you getting good power after the turbo spools up to about 2K rpms?
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Sam
84 300SD 350K+ miles ( Blue Belle )
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