Welcome aboard capestriper :!: :!:
Nice looking rig 8)
You can go to most marine surplus places and look through their inventory and probably find what you're looking for. Usually it's the handle part you're looking for, not necessarily the switch itself.
Did you look in the Resource Forum and see if there is a marine Electronics link somewhere in there? I'm sure there is and there should also be a marine surplus link or 2.
Off topic - what is up with that water line on the rocks behind your boat? The docks don't appear to be able to move that high - hard to see, are they floaters - so I'm confused
And if it is a tide line, you're definitely NOT from FL.