Coolant fans wont kick on and my temp gauge never moves passed a certain point

What is your question?

We hooked a toggle switch up so I manually turn them on...we changed the water pump, thermostat, sensor and relays.. The gauge never moves higher than like 180 even without the fans on. Whats going on.. The person I bought it from bypassed the AC part on the serpentine belt..could that be why? Or if the gauge is broken would that affect the fans not coming on? Why won't my fans kick on?

How long has your 1992 Buick Park Avenue had this problem?

Months