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3. For this install, we needed this MSD Ignition tach signal GMR pickup (not included, but available from Drag Specialties). The GMR inductive type pickup senses the high current draw in the 12-volt power wire of the ignition coil. The sudden rush of current pulse is sensed by the GMR adapter, which produces a 12-volt square wave signal to trigger a tach or rpm device, according to Doug. View Related Article
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