I don't know which of the three hoses would be the right one but i was thinking of tapping into of them with my boost gauge. Easier than Johanns way, i think.
Your question would answer itself if it works, no?
The pressure to the wastegate is not the Boost Pressure. You should not be tapping into those lines for Boost. Johann's pix (and mine in the other thread) is the only correct place to measure the boost that is in the intake manifold
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