An arrangement of material layers designed and utilized as a filter to mechanical waves entering a sensor. The control bus supplies a low voltage power source and the addressable power switch includes an energy storage device and charge circuit for deriving a charge current from the low voltage power source and charging the energy storage device. The license plate is fastened to the frame by attaching the license plate to the shock-absorbing member. A pneumatic bulb is also attached fluidly to the sleeve through a receiving port which is provided on at least one of the socket and the gage. The control block accepts filtered transition-data and data-transition phase state signals and converges to a phase aligned state in less than 2N-bits where N represents the number of phases in one data bit. The method comprising the steps of providing a mechanically commutated electric motor, providing a power supply for said mechanically commutated electric motor via electrical supply leads from power supply circuitry, providing a filter connected to said electrical supply leads, detecting with said filter a voltage spike occurring at commutation, outputting from said filter said trigger signal.