From Modern Vespa: http://modernvespa.com/forum/topic100460
"Yes, you can change the odometers from km to mi. Go to the voltage readout using the mode button, then hold the mode button down for a ten count. The mode readout can then be changed to mi. Of course, that doesn't help with the speedometer readout. I have seen others use thin strips of colored vinyl tape on MP3s to accent several mph reference points to make the speedo easier to read. I'm thinking I will try that with my BV."
1980 Vespa P200E
2006 BMW R1200GS
2012 SYM HD200 Evo