I believe there is a diagnosis button on the main menu screen
When you go into that there should be a single line at the top that says something like OBD generic A, B, C, I think, I haven't checked it in a while
Any way make sure your on the first one and the exit out of that menu
Then go to "gauges" and select the set up that you want
Then tap on the gauge and you should get a screen that gives a selection of what you want to read, engine temp, boost, EGT's, etc.
Then you can set the range you want to read, the low warning and then the high warning