daxavier wrote:
US. That's where I saw several people put theirs. Every forum mentions using those engine cover bosses. Am I on the wrong side? The turbo is over there so shouldn't that be the cold side? Haven't noticed any coolant loss.
Look at the pic below, this is where I installed mine, with weeks kit it's fairly easy.

I have well over 20k since I did this and it's working good, no leaks, all ok. The metal is reasonably thick there and it's safe also to thread as metal shavings will fall down, provided you remove the elbow. I also have a gauge write-up in the tech forum for more details if you need.
Another alternative is to get weeks intake, it comes already with a 1/8npt port, if you don't feel like drilling. Pretty much anywhere you have pressure, from turbo outlet till valve cover, including intercooler (I don't recommend you installing in plastic though) you can mount the probe.