Engine temp sensor and gauge?

carnivorous chicken

Over 1,000 Posts
http://vancouver.en.craigslist.ca/rds/mcy/4023090732.html

Someone pasted the link to this in another thread, and this caught my eye:

"engine drain valve modded to house temperature sensor which is connected to temperature gauge in cluster"

Anyone ever done anything like this? I am imagining just drilling through the drain plug and sealing some kind of temp sensor in it, then running it to a gauge. But... which sensor?
 
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