Digital 6M-3L Marine Marine Certified, Digital Capacitive Discharge With Built-In Rev Limiter And Start Retard MSD IgnitionThree rotary dials and an LED display simplfy setting the cylinder select, start retard and rev limiter. Plug in rev limiter chips and hard to read dials are a thing of the past. For diagnostic purposes, the LED display can also be set to a live tach mode on V8's and even display battery voltage with the turn of a knob. We've raised the bar and added an all new UL listed marine ignition box to our lineup. The 6M 3L is a fully sealed unit with a single