MSD 8671 RPM Module Selector, 4.6K-6.8K
The RPM module selector plugs directly into the RPM module socket on all MSD soft touch rev controls and accessories that use plug-in modules. 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.