The next thing I did was to see how cold the fridge would go if I just turned it on "maximum". I don't know exactly how cold it will go b/c I stopped it at 26 degrees... this was good news because if "maximum" wouldn't go to at least freezing I was going to have to bypass the thermostat.
I then wired up a Ranco thermostat to the unit and mounted it in the rear next to the compressor.
By setting the fridge to "maximum" I can now completely control the temperature of the fridge all the way down to freezing if I want...
For the temperature probe, I did the exact same thing as my walk-in cooler and used a White Labs yeast container filled with the goop from a freezer pack. I pushed the probe through the drain plug into the fridge and mounted it at the very top as near to the front as I could. It is attached with two heavy zip ties.
Thats as far as I've gotten so far as my tower hasn't arrived yet... so it will be a few days before I get to drilling out the top.