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You can do that, or even better, you can get a T-fitting and do both at the same time, for guaranteed synchronization.

Different strokes for different folks. I would always recommend verification of synchronized opening. Wastegate troubleshooting is not fun with the engine in the car. It obviously comes down to...

I disagree. I would absolutely test wastegate cracking with every turbo replacement. A mityvac is cheap, and synchronization between the two sides is more important than the exact absolute cracking...