Civic EG

Driving this morning and noticed the temp groping while I press the gas... when I let go it goes back up to normal and back down again when I press the gas... it never did that b4 and idk what it is... thermostat maybe

I did change out the cooling fan cus mine wasn't working

the temp sensor wires/connector could have play . try wiggling it while a friend looks at the temp gauge . Also inspect the wires connector could be an exposed wire or loose connection .