Mark,
I welded up a tube that comes off my output from the top of the head - the 
sensor is inside the tube to catch the heat of the water.  I found this to be 
much more effective getting my electric fan to turn on early enough to help 
cool 
the engine.  At least for me it turned out to be more effective than just 
sticking the sensor into the radiator as indicated in the instructions.  
Here are a couple pics of the set up before it went into the car.  
http://img.photobucket.com/albums/v47/75LesPaul/HaydenProbe_3.jpg
http://img.photobucket.com/albums/v47/75LesPaul/HaydenProbe_2.jpg
http://img.photobucket.com/albums/v47/75LesPaul/HaydenProbe_1.jpg
Kirk 
59 Bugeye 1275
 
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