LR> I was wondering if anyone knows at what tempurature does the sensor
 LR> turn the HOT light on the dash on?  I have never had it come on and
 LR> have since replaced it with a guage and wondered what is actually
 LR> considered "hot" ?
More than likely, anywhere from 230-270 degrees.  On a lot of late model GMs, 
it's 255.
I get nervous when I see my temp anywhere above 200 though.  My engine (Ford 
351M) generally runs from 160-190 no matter how I'm driving it, and about 
200-210 in the summer when I'm rodding it.
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