I gave the wrong response to this on my original reply, mixed the sections up.
To change the displayed speed to KPH, open the config.ini inside the skins folder and scroll right down to the [SPEEDOMETER] section. Change the line that says 'uom' from MPH to KPH.
To change the displayed speed to KPH, open the config.ini inside the skins folder and scroll right down to the [SPEEDOMETER] section. Change the line that says 'uom' from MPH to KPH.