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ignition timing on transistorized pointless ignitions and capacitor discharge ignitions a timing rotor and sensor send signals to the engine computer to let it know when to fire the ignition coils inductive coil pickup sensor the double-tab section indicates cylinder 1 so the computer knows when to fire ignition coil on cylinder 1 and the corresponding tabs represent the next cylinders in the firing order the gap between the sensor pickup and the rotor tabs is measured in thousandths of an inch and must be set accurately timing rotor keyyed to end of crankshaft 4 cylinder rotor shown timing rotor attached to end of crankshaft