I did a bit of digging around and the answer I kept coming up with was that all Jap Speedos were 2240:60
Is it not the tachos which were different
My cordless drill flat out is always 32-34mph
I bought a tacho with idiot lights off e bay coz i thought the tacho's were all the same. At least it was only £20 as was only meant to be temporary until i sorted other stuff out . Eventually want to go for a Koso all in one unit.