To be exact, the ultra gauge works with OBDII D1's.
I still prefer a mechanical (thermocouple) temp gauge.

 

Good point, the UG is an OBDII device. And a manual gauge avoids computers, A to D converters, and computer sub routines that push more computer cycles to what it thinks is more important at the moment. Kinda like your PC crawling because Windows has decided to do something for you in the background. I like gauges. Not sure about the rear view mirrors, it wasn't like many things could be gaining on you....