Before you suspect your temp gauge, check these out:
1) is the system bled correctly? As simple as this seems, air entering your system (from a leaky coolant cap, for example) can cause an overheat indication.
2) bad T-stat. George gave me(us) the 101 or should I say an advanced course on this recently.
3) a bad water pump. If it's leaking or you hear bearing noises, then replace it.
4) radiator plugged. How old is your rad?
Josh
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