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I use this analog thermostat from Johnson with my keezer: http://www.rebelbrewer.com/shoppingcart/products/Refrigerator-Thermostat.html (No affiliation with Rebel. Just like them personally.)

Doesn't require any splicing/wiring. Very convenient. Just need to run the temperature probe into the freezer somehow. (I have a collar on mine, so it works perfectly.)