Since I was this succesful in changing the stator/pick up coil, I start to look into the digital tachometer's problem again.

Needle stays at 0 since I got the bike, sometimes jumps a little, but I think thats only when the bike is shaking...

Can you tell me THIS bike's source of the impulse for the tachometer? As I read it's different for certain bikes.

Also: how can I test this source to rule it out as a culprit?
Also: if it's ok, how can I test the very end of the wire goihng inside the tach clock? Check the voltage in it, or how?