This is truly one of the best items to be developed for the Lambretta in the past 20 years, I have fitted a couple of them now and find if you use 0.8 as your cable drive setting that it is pretty accurate, my customers think this speedo is brilliant, the spark plug fitting for the temperature sender is a bit fiddly, but of you modify it and fit it to the cylinder head studs or a manifold stud it works fine.