For Canadians, Canadian tire has/had "K" thermocouples for $7.00 ($5.00 USD)
each.  No need to order from Omega or deal with minimum orders. You will
need to get some extension wire and junctions though as the leads are only
about 2 feet long.  I've used these for oil, coolant, air and exhaust.  You
can also buy cheap digital multi meters ($30 - $50) with K thermocouple
inputs, radio shack and canadian tire among others have these.

Gary Lee
http://www.telusplanet.net/public/gary2a/rack/vanagonrack.htm