The user can then select between twelve different rpm limits by simply turning the knob. Six models are available to cover a range from 3,000 rpm to 12,800 rpm in 200 rpm increments.

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MSD RPM Module Selector, Plastic, Black, 7, 600-9, 800 rpm, 200 rpm Increments, Each

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MSD Ignition RPM Modules, 3, 100 to 3, 900 rpm, Set of 5

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