Why would you have to wait to get another dimmer? You can pick them up at the home depot.
Doesn't matter that the UTH is already stuck. Most people don't use the sticky that comes with the UTH so they can re-use them on different tanks.
Thermostat probe goes OUTSIDE the enclosure right on the UTH. Just tape it directly to the UTH.
Your accurite probe goes right on the glass over the UTH (under the substrate).