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1983-1992 GMC G1500
1968-1969 Mercury Cougar
0 lbs / 450g
Retainer clamp bolts around most 3" O
1974-1987 Chevrolet Camaro
MSD RPM Three Step Module Selector 57105BK 1983-1992 GMC G1500The 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. As an example, well use a drag car with a Three Step Module Selector plugged into the rpm socket of a 7AL 2 Ignition. The different rpm modules are activated when 12 volts are applied to a corresponding wire. By connecting one wire to the line lock circuit, one module will be
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