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To test a temperature sensor, I would try getting a pan of water and an
electric hotplate to my hangar.  Maybe even a large styrofoam cup or thermos
bottle (steel coffee mug?) and a coil-type immersion heater.  Or maybe a
plastic coffee pot thing.  Anyway, just boil some water.  Dunk the probe in
the boiling water.  Read the gauge on the instrument panel.  You should be
able to get enough slack on the probe wire to just unscrew it from the engine
and drop it into the boiling water.

I will say that I have not tried this myself yet.  However, this technique
tests the entire system (probe plus electronics).  Note that a small
correction may be needed for higher altitude airports.  I don't know the
boiling point of water at altitudes other than sea level.

- Rob Wolf
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