BRAND/PART NUMBER: NEW MSD ELECTRONIC ENGINE GOVERNOR/REV LIMITERAPPLICATION: WHEN PRE-SET RPM LIMIT IS REACHED, SPARK IS DROPPED TO DIFFERENT CYLINDERSCOMES WITH 3,600 3,800 AND 4,000 RPM MODULESMORE LIMIT MODULES CAN BE PURCHASED FREE SHIPPING IN THE USA Be sure to add me to your favorites list!Check out my other items!Sign up for PayPal; the fast, easy, and secure way to pay online. Feel free to ask us about conversion kits for almost anything including trucks, cars, generators, tractors, boats, motorcycles, RVs etc. We can build a kit to convert almost any engine!WARNING:This product can expose you to chemicals including Lead and lead compounds, which are knownto the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the state of California to cause cancer. www.P65Warnings.ca.gov. WARNING: These products contain a chemical known to the state of California to cause cancer and birth defects or reproductive harm. www.P65Warnings.ca.gov.