I was looking at my roomates TD-05 in the living room and I found two holes for the oil. But there is this other hole w/ 2 bolt holes that go into the turbine. What is it for? Is this where you put the boost gauge or internal wastegate module? My first time hands on a turbo and it was kool, but I just couldn't figure it out. If anyone can identify this, let me know, thanks.

 

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