I just bought an indoor/outdoor thermometer today. Where in the tank do I attach the probe and the temp gauge? The probe is on the hot side and it's about 2-3 inches from the top and the light source. The temp gauge is on the cool side and about 2 inches from top of cage. I plan on adding another light source to the cool side as I cannot get the temp to good level on that side.

And yes, I am a noob