http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=36628&item=2480226901&rd=1
will do our metricated users.

Looks good for a BEC. If it is programmable, does it matter that it is in KM's. Could you not work out the diameter of the wheel tyre combination and then multiply by 1.6 to convert from km to mph??? (Obviously i'm not much good at maths or electronics).