*** IN STOCK SHIPS TODAY *** MSD 8739, 2-step module selectors let you choose from two different rpm limits that can be activated at different times. For example, you can use a lower-rpm module for staging and then automatically switch to a higher-rpm module after you release your trans-brake or line lock.
Module selector requires the use of RPM plug-in modules, which are available separately under part #2500-0073.
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