I think you are going to have to experiment. The inertia is going to kill any acceleration/deceleration of the tach display. I suspect a simple DC motor will be just as effective as a brushless motor.
Paul
I think you are going to have to experiment. The inertia is going to kill any acceleration/deceleration of the tach display. I suspect a simple DC motor will be just as effective as a brushless motor.
Paul