How do you change electronic coolant temperature sensor?

I've tried finding out how to change an electronic coolant temperature sensor on a 1994 Isuzu Trooper, and I would like to know how to do so. I need to know how to install it.
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Here is link to a picture taken from the rear of the engine while on an engine stand. good luck.
http://www.carspace.com/atfdmike/Albums/trooper/sensor.jpg/page/photo.html#pic
http://www.carspace.com/atfdmike/Albums/Isuzu Trooper/sensor.jpg/page/photo.html#pic
from first to second. What could be the problem. Please advise me what it could be and how to repair. thanks much