Detonation sounds like a “ping” and can occur at any time. If it’s left uncontrolled , severe engine damage may result. The MSD Engine Knock Alert listen to what's going on in the engine for you since often times excessive road noise and insulated interiors and engine compartments make detonation hard if not impossible to hear.
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MSD Engine Knock Alert

 MSD UNIVERSAL CAM SYNC PICKUP KIT
MSD P/N 8964
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MSD Engine Knock Alert
     One of an engine’s worst enemies is detonation. Detonation sounds like a “ping” and can occour at any time. If left uncontrolled, severe engine damage may result. Detonation is caused by a number of different items such as low octane fuel, changing altitudes, and too advanced timing. Sometimes however, the pinging noise may be hard to reconize due to well insulated interiors, engine compartments, or excessive road noise. The MSD Engine Knock Alert listens to what’s going on in the engine for you.
     As detonation occurs, the warning light first shows green then turns yellow as the detonation becomes stronger. When the knocking is extremely severe the light reaches the red stage. Like the warning light, the aleting beep grows louder as the severity of the detonation increases. There is also an overall voume control for the beep alert.
     The Knock Alert is easy to install and features matching Weathertight connectors for firm connections. It will work on all 4,6, and 8-cylinder engines with 12V electrical systems and comes complete with sensor, adapter, and controller.