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Watch your eyes!
Joined: Mon Oct 23rd, 2017
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The gauge itself will not cause the check gauge light to come on only the sending unit can.
The thermostat could be stuck closed and the system was never purged of air because of that.
As Tony said, the gauge hardly ever goes bad except for an occasional needle falling completely off.
I don't have a manual but I'm pretty sure that 3.0 has 2 water temp sensors. One for the computer and one for the gauge. If your OBD scanner can see water temp and it is rising it might just be the sending unit to the gauge which would cause the light to come on.
The sending unit for the gauge only has 1 wire and the one for the computer has 2. Should be easy to figure out which one it is I think I would replace it regardless.
The one wire one is by the thermostat right?because that's the one I replaced along with that outlet was well because it was rusted up. I'll probably replace it this weekend and let y'all know what happens. There isn't a fuse for it huh? I haven't checked for it yet and only just thought about it.