Is a fluctuation temperature gauge normal?

I have a 96 Explorer, 4.0L V6. The temperature gauge is fluctuating between slightly over the "C" and about midway. It slowly raises & then goes down, repeats over and over. My husband has changed the thermostat, water heater & fan clutch. The heat still works and it hasn't over heated to... show more I have a 96 Explorer, 4.0L V6. The temperature gauge is fluctuating between slightly over the "C" and about midway. It slowly raises & then goes down, repeats over and over. My husband has changed the thermostat, water heater & fan clutch. The heat still works and it hasn't over heated to "hot" so I don't think its a head gasket. My question is: I have seen on some sites that this fluctuation is normal. Anyone mind giving your opinion? I'm at a loss.
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