This site has info on setting up X-Gauges; the example is SOC. There's also an Excel spreadsheet of X-Gauges; I don't know how many of these work on the C.
I have looked into this and like it. I would think an old iphone 3 would need to be mounted, for my use. Don't want to tie up my regular iphone. Thanks for the link. Dan
The biggest thing i feel it can do for us is show the the RPM the engine is running at. The car as-is does not tell you which if you drive like i do make things a little tricky. Plus you could really look like a cool guy when one of your co-workers is complaining some noise their car is make. Revan