MSD 7551 Launch Rev Limiter Switch Box

This handy controller lets you change the launch rpm setting instantly for last second changes in track conditions. They plug into the RS232 computer harness and have two rotary dials for adjustments. Instantly changes the launch RPM setting of the Programmable Controls. Two control dials, one for 1,000 RPM and another for 100 RPM. Adjustable from 3,000-12,500 RPM in 100 RPM increments. Can only be used with programmable MSD Ignition Controls and Accessories.