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Update on this (if anyone cares): Pickup location did make a difference. I plugged the spot I drilled and re-used the port in the center of the upper. However, I also added a female/female NPT coupler and a 2" piece of brass tube on the inside. Enough to make the tube stick down halfway into...

Interesting product. I wonder if he's doing that to pickup the "signal" down and away from the airflow from the turbo. Those uppers are pinched down pretty tight where the curved portion meets the polygon section with bolts. I'll probably pick one up to try.

I was driving it around. Highest I got it was WOT in 2nd gear (manual tranny) uphill. After upshifting to 3rd I ran out of road/speed limit before building any boost. In one test I used a spring so tight that I couldn't compress it any more manually so the wastegate should have been sealed...

Does it matter where you tap the hole for a mechanical boost gauge? Do you need to pick the location carefully to avoid berneulli affect from giving low readings? So reason I ask is that the first place I tried was the port on top of the intake upper used for the EGR from the factory. That...