Had a guy install my boost gauge and I'm wondering if he tapped into the right place for a reading. He tapped a thread into the intake manifold just past the turbo. This seemed a bit odd but he was insistent that that was the best location to pick up the boost. I thought you simply picked it up from the vacuum line running from the injector pump to the turbo?

Can someone clear this up for me? Did he do it right or do I need to tee into the vacuum hose? Here's the picture of what he did and the instructions for the gauge install.