The problem with older boats is finding replacement parts. My suggestion, if possible, would be to take a picture of the front and back of the switch and take it to a repair shop, hopefully a dealer that services the same brand of boat as yours. Sometimes you can get lucky and find a youtube video that relates to your situation. Without more specifics it's going to be difficult to get help on here.
I am a Senager. (Senior teenager) I have everything that I wanted as a teenager, only 50 years later. I don’t have to go to school or work. I get an allowance every month. I don’t have a curfew I have a driver’s license,a car and I have a bass boat.
Duct tape won't fix stupid but it will muffle the sound, lol.
illegitimi non carborundum