A switch box is often needed in a boat, car, stereo and any machines. The switch is used to control the motions of machines, interrupting the current of electrical component or diverting it from one conductor to another. CDI manufactured different switch box to fit for boat engine. MagemarineStore will help you find your switch box. One of the switch boxes we have is part no. 114-2803 to use for Mercury engine with 95 HP and 110 HP. Fits for year 1966-1967. The Switch box and ignition coil are attached to a mounting plate for easy installation. This unit is a replacement to the original case. It does not contain a rev limiter or tach circuit. You can replace your old mercury switch box with part numbers 332-2803A3 and 332-2803A4.