Help, I'm due to leave for eurotunnel in a few hours and not sure to change my speedo from miles to km. Must the engine be running when you hold down the select button? How long must you hold it for until it changes? Do you have to hold the select button before you switch on the ignition and or start the engine. Please help a desperate man.

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2010 XT660Z Blue, Exan can, UFO high front fender, SW Motech baseplate, heated grips, 12v point, Kevs Fuel & O2 mod, DNA Stage 2 Filter and cover, Givi tall screen, Mefo mfe 99s, Kevs throttle mod, TT high seat and 'compass'