[njk53]

I worked as a development engineer at GM and we would place the temperature probe in the transmission stator which is the point where the trans fluid is the hottest. For racers like us it would take a lot of heartburn to do the above so what you can do is put the probe in the outlet trans line (going to the cooler) as close to the transmission as you can get it. That should get the job done. Putting the probe in the pan is OK but the fluid has a chance to cool in the pan so the temperatures will be lower.