MSD Ignition 8737 | Universal Three Step Module Selector

MSD 8672 RPM module selector. Features adjustable range from 6,000 to 8,200 RPM, universal fit for MSD ignitions, ensures precise rev limiting, sold as each.

MSD 8671 RPM module selector. Features adjustable range from 4,600 to 6,800 RPM, universal fit for MSD ignitions, ensures precise rev limiting, sold as each.