I now have developed a question.

With the sender in it's original location, which is very close to the glow plugs, seems like that part of the head would heat up and tell the sender to cut off the glow plugs.
With the sender in the other location, it will only read warmth if the engine has been up to operating temp recently. When engine cold, it would seem like it would never turn off the glow plugs, at least until a timing circuit cuts it off, if there is such a thing.
Am I overthinking??