One of the forum member here Mike Chan, has told me he has seen many people putting them in the Drivers Exhaust Manifold apparently you can get to it from underneath the manifold and lowering the risk if your doing it while still on the truck to get metal filings in the turbo.

I would recommend using going slow and then just as your about to go though put grease on the bit so it hold more metal. Also I would recommend using a unibit its easier to keep clean and control of the metal shavings.

Currently mine is installed post turbo about 3" from clamp thats on the rear of the turbo. I plan to add another gauge in the manifold as well so I have two reference points to monitor. I plan to add my second one this weekend if the rain they are calling for doesn't happen Ill post pics of the setup.