Bluefire Discount code
I have a Bluefire monitor and its capabilities are great. It allows you to monitor anything on the engine/chassis bus, such as transmission temp, DEF temp, DEF quality, as well as fluid levels, etc, and then set alarms. Read any codes you have.
They agree that Super-C owners are awesome and created a discount code "Super-C" that gives you 10% off your purchase. Its an amazing device/capabilities for the $. Highly recommend it.
BTW - if you have S2RV, this is a great way to ensure your DEF tank/heater is working correctly.