Q9. My boat doesn’t have an Engine Cut-Off Switch, do I need to install one?
A9. No, unless the boat was built on or after 1 JAN 2020. The installation requirement applies to manufacturers, distributors and dealers of “covered recreational vessels” after 1 JAN 2020. For those boats, an Engine Cut-Off Switch must be installed and the owner is required to maintain it.
this is right from the coast guard site