You actually want to put it into the manifold not the IC pipe, I did lots of development on the SD rom over the past year or so trust me on this. The air temps at low loads a quite a bit different from before and after the throttle body. I replaced the PCV valve on my car with a sensor I made from an old MAF IAT sensor(you just cut it off with a dremel) and a plug. I have tried several sensors including the spec c manifold temp sensor that heat soaks horribly and the GM sensor that requires a huge hole in the manifold in addition to a MAF in blow through in the pipes. Here is the solution I made.
To make your own cut the thermister off of an old MAF sensor and solder on some leads, you have to use silver solder since the thermister metal is not wetted by lead based solder. Drill a small hole in a 1/4 BSP plug if you want to use the PCV threaded hole and put the thermister into the plug. Pot the sensor into the plug using high temp silicone to make a pressure tight seal and to limit heat transfer from the manifold. Mine has held up for several months already with no issue in the arizona heat. It responds very quickly to changes and fueling is always stable even with big temp swings during the day 50-60s in the morning and night and 100+ during the day.