anyone used one of these? and haw good are they?
http://www.quad-master.co.uk/catalogue/quad_master/accessories_digital_speedo.pdf

Well, the same dash is discussed here:

http://www.locostbuilders.co.uk/viewthread.php?tid=71784

And for the records, it's a KOSO XR-SR N dash.

i have just sent away for one

http://scooter-center.com/catalog/product_info.php?cPath=429_442_4769&products_id=10978&PHPSESSID=af431d9e7af0e151543a0a7e