tout, welcome to the forum.
Under the right-hand round display on the i-MiEV dashboard is something Mitsubishi calls a Reset Button. When the keyswitch is ON, this button selects what parameter is displayed (Odometer/Trip Odometers/Dash Lights Brightness/Service Reminders/Range Remaining/Outside Temperature).
To change the units from Imperial to Metric or vice-versa, turn the keyswitch to ON and momentarily push the Reset Button to cycle through the displays and select the
Odometer. With the Odometer showing, press and hold the Reset Button for at least two seconds to change the display from Miles to Kilometers (or vice-versa).
This will change the units on the odometers and speedometer.
Similarly, to change the Temperature from °F to °C (or vice-versa), with the key in ACC or ON, use the Reset Button to select Outside Temperature and then press and hold that button for at least two seconds and the display will switch units.
BTW, tout, it's always fun to know where in the world someone is located, as we occasionally find other i-MiEV owners close to us. You might consider updating your profile, the procedure described here:
http://myimiev.com/forum/viewtopic.php?f=13&t=3196