It's a common problem and there is nothing you can really do about it
Yes, common issue. Airtight speedo gauge is available from their same supplier, but it costs more. Cool nights draw in air or washing the bike, riding in the rain. Next day as you ride the sun expands the air and water condenses on the cooler lens until air movement and the suns warmth evaporates the moisture. Then it does it all over again the next day.
Ever took your camera outside to grab that quick photo only to find you had to wait due to the lens fogged up?
EDIT: or jumped in a hot shower with 100m waterproof watch on, only to find moisture build up afterwards?
Last edited by Tampa Fatboy; 10-01-2015 at 09:10 AM.