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Pulses of light blink every time the cylinder which the timing gun is hooked up to fires. Typically, a timing gun is hooked up to cylinder #1. When that cylinder fires, a pulse of light occurs. The timing gun it to be aimed at a marking on the front of the engine, usually the harmonic balancer. By looking at the mark, you can determine how advanced (ahead) or retarded (behind) the engine is running. This is usually measured in degrees.

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Q: How do you read timing gun?
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