valve gasket replaced today, oil change, and tune up. Temp gauge stopped now? on 2002 Toyota 4Runner

Temp gauge stopped working today since this work was done. Can the two be related? It worked just fine before, including on the drive to the dealership. Could they have unplugged something or knocked something loose?

Asked by for the 2002 Toyota 4Runner
Sure; The sensor could be not making good contact or not plugged in correctly.
Thank you, ProfessorG. In the photo, where is that located? The pic is small and I can't really tell.
It's in the rear of the engine behind the fuel rail crossover, center area, coolant sender for the gauge. The coolant sensor is on the passenger side in front of the first fuel injector.
Great! Thanks, again!