Hi, there is a Home button that takes you to a central screen with the following options:
Scan - for OBD 2 fault code reading & resetting.
Gauge - has all the car information such as water temp, rpm, mpg etc.
Trip - has information on your trip vs fuel tank, info such as miles till empty, time till empty, cost per mile for fuel etc etc.
X-Gauge lets you make your own gauge (such as BHP) you have to enter a few strings of computer code supplied by the company that makes this device.
If you wish you can have a look at the online operation manual - go to: http://www.scangauge.com/support/pdfs/SGMan5_0.pdf

