you ask for a professional opinion and i gave you one and that's not what you wanted to hear so you sided with tech. you are not getting a accrete reading screwing the sensor into the chase at any point. the case temp is dif from oil temp. its got 300 lbs. of pressure in the test plug and the sensor is not made for pressure, teeing the sensor into the cooler line is a waste of time it wont give you any useful info. at all and if you don't believe me call GM and ask them and if you are just experimenting with it you should have gone and did it without ask for an opinion. you didn't wont an opinion you wonted somebody to tell you what you was gonna to do was a good idea and when you ask a ? with no intention of listen to the most qualified answer then that's wasting my time. all tech told you was how to hook up the sensor in the cooler line he didnt say whether it would work or not. i took the time to post a answer and it was totaly ignored, you could have said thanks lt1 or kiss my a*s lt1, but i would rather do this or thats not what i wonted. i try to pick the threads that really need some help, but i miss one every now and then.