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The MSD Module Selectors allow you to choose two or three different rpm limits that can be activated at different times. With this ability, the possibilities are endless.The Module Selectors can also be used with and MSD Timing Control. By plugging the Selector into a retard module socket, you can activate different retard amounts at select times. This is a great feature for engines being upgraded to a multi-stage nitrous system. With the addition of an PRM Activated Switch, you can use the Two Step to activate a shift light at differeent rpm. The Module Selectors must be used with an MSD Soft Touch Rev Control or a Timing Controller with a high speed retard module. No rpm or retard modules are supplied. TREE STEP   $89.99 TWO STEP  $79.99