hi, it could be that you have moved the outer ring to the tacho on the motor,look between the brushes and in the middle is a revolving magnet which then is circled by a coil, this coil is then covered by a gold coloured ring, ive knocked this before and had too higher speed rotation, turn it a little at a time then test, failing that you will have to replace the module-at the other end of the motor wiring loom.
mark, October 2005