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I installed mine in the Y pipe before the turbo. That way it reads both sides. Easy install, just use progressively larger bits, go slow, & have the ruck running to blow any small particales out. Several guys around here have installed thiers in this location but both locations work fine.
On the driver's side toward the rear as far back as possible. I used only one drill bit and watched all of the shavings fall away from the hole. When tapping it I used grease to capture the fine shavings. As an added precaution I used a shop vac on the hole to suck out anything that got in.