School me on trans basics

thats why I want to pull from the pan. "hot" fluid is going to either drain back to pan, or be routed to the cooler, "cooled" fluid will be routed back to pan, so taking your measurment at the pan is the average temp. Now I can see value in pulling from the out going line to the cooler. Allow you to see temp spikes etc. I can also see value in pulling from the return line from the cooler. Allow you to see just how efficient your cooler is performing. But since I'm only going with one gauge and one sender, I think in the pan will give me a good view on the over all function.