8671 RPM Module Selector, 4.6K-6.8K. The user can then select between twelve different rpm limits by simply turning the knob.
MSD 8670 RPM Module Selector, 3000-5200 RPM, 200 RPM Increments (NOS)
MSD Ignition RPM Module Chip 8000-8800 RPM, 200 RPM Increments, Kit
MSD Ignition RPM Module Kit 9000-9800 RPM, 200 RPM Increments - Part 8749
MSD Ignition RPM Module Kit for 4100-4900 RPM, 200 RPM Increments - Part 87441
MSD Ignition RPM Module Chip Kit 3100-3900 RPM - 200 RPM Increments
