M5stack dial spliced into CANBUS Hi/Low, GND, and Radio 12v with M5 CA-IS3050G which provides 3.3v logic to the Dial. adding a Dallas 2-wire temp sensor just downstream of the heater core allows temp difference (delta) between intake air and cabin air vent temp. For me, this provides two top priority infometrics. There are many others. The Dial provides simple switching between these displays and is completely upgradable vua USB-C.