A magnetic pickup is normally installed into the flywheel housing of an internal combustion engine, so that the starter ring gear acts upon it to generate a voltage pulse each time a gear tooth passes the end of the sensor. The frequency of this voltage is translated by the speed control into a signal that accurately depicts the speed of the engine (RPM).
How to Install and set the Gap Adjustment
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Locate and remove the existing magnetic pickup on the engine.
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Using a standard flat head screwdriver, orient the teeth of the flywheel so that a single tooth is centered on the hole.
BEFORE – Tooth NOT centered. 
AFTER – Tooth centered in the hole. -
Apply grease to the threads on the magnetic pickup.
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Thread the magnetic pickup until it bottoms out directly on the centered flywheel tooth.
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Once the pickup has bottomed out, turn the pickup back out exactly one half turn or 180 degrees back out.
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Set the nut tight and connect the pickup to the engine harness.
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