MSD's 6M-3L MSD Marine Ignition is a fully sealed unit with a single wiring connector for a fast, hassle-free installation. Three rotary dials and an LED display simplify setting the cylinder select, adjustable start retard, and rev-limiter and make plug-in rev-limiter chips and hard-to-read dials a thing of the past. Compatible with 4-, 6-, and 8-cylinder engines, this capacitive-discharge ignition multi-sparks from 0 to 3,000 RPM for a clean idle and quick throttle response, and capacitive-discharge sparks run from 3,000 RPM all the way up to 12,000 RPM.