The MSD Two Step, PN 8739, Three Step, PN 8737, and Launch Control, PN 8735, Module Selectors allow you to switch between two or three different rpm or retard modules. The different modules are activated when 12 volts are applied to the corresponding wire. They must be used with an MSD component equipped with a rev control or timing control module.
Click here for the Two and Three Step Modules
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