Holding down 'RESET' (in either odometer or engine RPM mode - not one of the resettable trips) will cycle between displaying the time and the intake temperature.
Holding down 'SELECT' (pretty sure this can be done in any of the odometer/trip/RPM settings) will switch between MPH and KPH. It will also change odometer readings between miles and kilometers. I've never checked, but I bet it changes intake temp. between °F and °C too.