Dodge 2008 Ram Pickup 1500 - Manual (Page 152)

This overhead console allows you to choose between a
compass/temperature display and one of four trip con-
ditions being monitored.
US/M Button
Use this button to change the display from U.S. to
METRIC measurement units.
RESET Button
Use this button to reset the following displays:
Average Fuel Economy (AVG ECO)
Trip Odometer (ODO)
Elapsed time (ET)
150 UNDERSTANDING THE FEATURES OF YOUR VEHICLE