[Kreator]

From what i've been told, ideally, u'd want to measure it from somewhere inside the intake manifold. That way, you are actually measuring the real boost/vacuum your car sees. domestic aftermarket engines usually have a tap like that. Our cars (i think) don't.

So, the next closest to perfect is right at the TB. Now, at shifts you'll see some rise in boost, while your car is actually not seeing any of it.

The last and easiest (cuz all you need is a fitting, since turbos come with a threaded hole for it) is at the compressor outlet. That way you are reading what the turbo is producing, but it doesn't take in account any pressure drops along the way (like an ic).

Someone correct me if i'm wrong.