The Marine Rev Control plugs directly into the 6M-2 Marine Ignition and will protect your engine from over revving caused by broken drive components or when the boat's drive mechanism comes out of the water. Circuitry in the Soft Touch drops the spark from one cylinder at a time and then fires that cylinder on the next cycle for a smooth limiting action without backfires or roughness. The rpm that the limiting action occurs at is adjusted with plug-in modules and is supplied with modules for 4,000, 6,000 and 8,000 rpm. Marine Rev Limiter, for MSD 6M-2 Ignition 8768$132.99 Don't see what you want? .......... Need help? Or, IF THERE IS NO ORDER BUTTON AVAILABLE on the part you want to buy, please call us TOLL FREE at 1-888-6 GO FAST(1-888-646-3278) Monday - Friday 8AM - 4:30PM Pacific Time and talk to one of our experienced Sales Agents. Some parts may not be legal for sale or use in California and other states on any polution controlled motor vehicles. Check your local laws for use. Copyright © GoFastParts.com all rights reserved. No part of this site may be reproduced without prior written consent.