Sorry to say, but since my original quest for a replacement gear...I was able to find a really rough replacement saw that looks like it had fallen into a wet mortar bucket, but the gears were intact, and the guy only wanted $15 off Craigslist in Atlanta. I live in Charlotte, but have friends in Atlanta...so was able to have friend get and hold for me till I visited again.
Sometime last year, I had someone request to me for the switch, and I recall that it was integrated with the little circuit board that is used to drive the speed control pot.
I think it's a long shot for you to come up with a replacement...but, if you're fond of this great old saw and all else works well, you may consider finding a friend who is adept at electronics repair. The components are few on this little board, and even the switch is likely repairable by removal of the rivets and some cleaning of contacts.
If you decide to sell the saw for parts instead without getting into the electronics side...reply and let me know.
Good luck whichever way you go...I hate throwing good tools away that I still have a need for and can fix...I suppose alot of us are. Our society is now so much more driven by the HF disposable tools (I'm guilty too, to some degree).