I think it only helps for those of you who have fitted fuel injection and the ECU but this works nicely on our UK bikes:
http://www.pzracing.it/catalogo-2/pr...-zero/?lang=en
I guess if you are having shifter magnet accuracy issues the only other way to go is to find signals such as wheel speed and rpm to feed in to a device like this (or similar)?
What signals do you have easy access to on the carb'd bikes?
Cheers, Pete