It took a while but I finally got the bike running again and can finish this thread. I don't think that I'd do it again like this but it works and I'm pleased.
I did some research and got indications that a fan switch from a Geo Metro, 3-cylinder (1.0L) matched the threads and temp rating. I couldn't get one locally so I found the part on RockAuto.com
for $8.23 + $6.29 shipping. Click the Part Number Search
tab and put in the mfg. and number.
1994 Geo Metro 1.0L 993cc 61cid L3 TBI
Radiator Fan Temperature Switch. Mfg: Beck/Arnley
, Part# 2011614
(I see they're offering the closeout switches even cheaper now.)
The Geo switch does not have the long probe that goes into the thermo housing. It also has a different connector. So I fashioned a pigtail from 4 inches of wire and bullet connectors. Then I shrink-wrapped it all and stole a black rubber foot off grandpa's cane and here's the finished product.
I couldn't find any specs on what wire is which so I just chose one side to be green and one side to be white/red (I think those were the colors). I figured if it didn't work I could switch them.
Amazingly, it works! Fan comes on when it should and all is well.UPDATE:
Though this switch worked I ended up replacing it with an OEM switch (about $80) when I later replaced the water pump and head gaskets..
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