The ignition module uses the pick up coil's voltage pulse to act as both an RPM and timing sensor. It is used to switch the ignition coil at the right time and for the right amount of time in conjunction with the ignition module. A coil of wire responds to changes in magnetic flux passing through its ends rather than a magnetic field. A pulser coil is used to create a pulse (or spark) that starts a car's ignition. The timing and ignition system of an engine depend on the pick up coil. For help finding the right pick up coil for your application, reach out to Dhingra Scotways.