the temp gauge in dash won't move I tested the coolant sensor it is good fuses are good anybody have a clue what might be wrong

whats the temp out side where you are? i have a 2000 contour in winter the temp never moves but in the summer it will go up. it's called over cooling.

whats the temp out side where you are? i have a 2000 contour in winter the temp never moves but in the summer it will go up. it's called over cooling.
it's been 55 to 60 I tested the coolant sensor and it test fine