Originally Posted by bicycle_wreck
Thanks for reporting back. Please let us know if the temp gauge fluctuates any more. Sorry to hear about all the trouble.
I have a sneaking suspicion that the thermostat is responsible for the gauge. Just my theory, though.
Yea that was my initial thought, I've had enough cars have small issues with the thermostat or the sending unit. But I was thrown back when they said the head gasket.