Originally posted by Tired2
There is some good info here: http://www.msextra.com/forums/viewtopic.php?f=101&t=45400 I think you can 'calibrate' it, but you should not need to if you know it is a good GM sensor. I'd guess wiring. Did you follow the guide for proper grounding and bring all the sensors back to the MS unit instead of just wherever they land?

By the way... for those of you following this thread and for future reference. The temperature issues I was having were because I never set the sensor types in Tunerstudio. Everything I read says GM is the default but I still had to go to "Calibrate Thermis..?" in Tunerstudio and select the GM sensor for both the IAT and Coolant sensors. Fixed my temp issues right away.