FOUND THIS NOT SURE IF ITS ANY USE TO YOU GUYS!
i bought one just to see if its any better than what ive got!
http://cgi.ebay.co.uk/LCD-DIGITAL-SPEEDO-ATV-QUAD-ltz-kfx-trx-yfz-polaris_W0QQitemZ4580910658QQcategoryZ36628QQrdZ1QQcmdZViewItem

....or just use a bicycle speedo for about £15!

got a bike one but i think i may need some goggles to see it !
also its another gadget to play with
whilst waiting for my prop shaft!

ok its another toy