MSD This Switch will supply then remove ground to a circuit. 8950 1969-pontiac-grand-prix-esi7494647 RELIABILITY BACKED FOR A LIFETIME

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No cutting or drilling required for an easy installation process that does not require aftermarket tuning for exceptional HORSEPOWER and TORQUE GAINS straight out of the box

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MSD This Switch will supply then remove ground to a circuit. 8950 1969-pontiac-grand-prix-esi7494647 RELIABILITY BACKED FOR A LIFETIMEThese RPM Activated Switches will perform a variety of different functions from turning on a bulb or solenoid to activating an MSD Timing Control at a desired rpm. The RPM Activated Switch, PN 8950, has two activation wires; one to ground a circuit and the other to open a circuit. Simply plug in an rpm module and wire the Switch to the circuit you want to activate. When the engine rpm reaches that amount, the circuit is activated and will remain on