I learned to program my TST system (older color version), I had to disconnect it from the Tow's power. I have the TST pressure sensors on my Tow and Trailer's tires, even though my Tow has a tire pressure monitoring system--this way all the info is on one monitor, which is located in the bottom left corner of my dash.
Also, get the Sun Shade from tsttruck.com, it will help with the glare.