Spent a lot of time getting a metal work/drive (ebay purchase) meshed in the hub (grinding paste etc - which is an important factor in any speedo)and got a threaded conversion to use standard lambretta cable. I turned the ali ring at work from a solid piece (cheap of ebay) £20 quid to bore and weld the ring.
The action ofthe needle is lovely and smooth on accelaration - only took it to about 45 at present round the block but i was impressed by smooth action going up and down.
Acurracy ..... who knows i ve done no re calibration (to 10" wheel) and to be honest i wont as the cost will outweigh the outlay- i`ll get someone to follow me in a car + ive got a rev counter to fit - to get an idea of what is 30/40/50 then after that who cares !
Early indications are good and the needle going right to left in a circular motion is novel ...... will update after a long run.



Mind just in case i have a stanard speedo headset top painted ready to bolt on if need be
gaz