Need to know where temp control sensor is and how to replace it.

What is your question?

Driving along, dash pops up "restricted performance", temp gauage shoots up within seconds and red lights. If you pull over and shut the car off (is not overheating) and restart the car, temp goes back to normal. Drive for 30 miles and it happens again. Again, it is not overheating and when restarted after just minutes, temp is normal. Seems more of an electrical/computer issue than mechanical.