The NC contacts (one of the pair) of a 12 volt 10 amp DPDT relay are bridged by a .25 uF capacitor and wired in series with the relay coil to form a vibrator. The relay coil is then wired across the ignition coil primary. The capacitor is essential, but its value is not critical but it should be about 400 volts. I use a condenser from a points/condenser ignition system. You only need one NC contact pair. The DPDT relay is easy to obtain but only half of it is used.
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