You can use the temp monitoring on the car's OBD connector by buying an inexpensive bluetooth transmitter. A free app on your phone can turn the display into almost any gauge you could imagine. Doing so, I noticed by '13 Impreza runs at around 190 degrees F.
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Answers
As for factory accessories, I didn't see that on their list. I'm sure you could hook up a generic temperature gauge of some sort.