Hello all.
FYI. Found this homebuilt electronic weathervane on the web:
http://www.geocities.com/weathermake2000/Weathervane.html
I just might try to build this as I have about a dozen reed-type switches and a plastic canister to hold them and the other parts.
Note: The website appears to have limited bandwidth allowance and so it may go down from time to time. My guess is that he posted it on a freebie website provider. Be patient it will come up again.