I use the scangauge in it's "gauge" function most of the time. Recently I realized that the honda fit doesn't have a temperature gauge built in. It has a dummy light for hot and cold, but that's all.
THe scangauge II has a tool that displays the coolant temperature, so it's just one of the four gauges that are displayed constantly. While other Fit owners are spending tons of money on after market gauages and sending units, the Scangauage II does it all for me.
Right now I monitor RPM, MPG, Coolant Temp, and MPH. I'm probably going to start monitoring the TPS sensor soon instead of the MPH.
Just realized I really don't need rpm since I have a tach and now that the engine temp takes longer to get up I may change back to water temp. The gph is really interesting to watch as it seems to relate to throttle position. I asked SG to have trip MPG available on the 4 number display . . . no luck.
I use rpm, mpg, water temp and inlet air temp. also switch between screens. i use rpm.s to help keep a light foot on gas and it show on the mpg gauge. water temp to see how quick car warms up. iat to see if it changes much but sometime i switch that one to gph.