I agree with Lionelhutz and mostly with fastacton.

Leave the CTS in the water pump, because the tune has been made for that temperature reporting location. This location will get an average of what the engine is actually at and under those conditions is what the tune has been set for. Moving sensors around like this can cause problems, because the PCM may think the engine is actually running hotter than what it's tuned for at those operating conditions.

If the water ceases to flow through the engine the temp reported at the cylinder head or the water pump to the PCM is not going to make one iota of difference in being able to save the engine.

On some systems I've seen some adverse results by placing the sensor in the head as opposed to a coolant crossover, or similar location, especially when the system was tuned with it in that crossover type location.

Also, just because the thread may have been tagged with certain items, does not mean that people will know. it's best to be explicit and mention exactly what the application is in the body of the question.