Mercury - Replacement Thermostat 60 Degree F Cooling Control Stainless Steel Construction 8M0119207. Overview. Any boater who's spent time navigating narrow channels at dawn or easing across a glass-calm lake knows how much trust we put in our engines. When the temperature is right, the motor feels smooth, steady, and responsive-almost as if it's reading your thoughts. That sense of calm starts with a simple but critical component: the thermostat. The Quicksilver 8M0119207 Replacement Thermostat