Once it cools down of course, check the coolant level.
The sensor is in the lower radiator hose on the starboard side of the radiator. I would at least consider a problem with that.
Air bubble is another thing to consider.
So far, your symptoms indicate nothing at all wrong other than the gauge, so hopefully the engine did not really overheat.
This post from
crowz +
overboost shows what temperature the gauge needle actually points to:
PA Soft 1.4 | Crowz Nest
So 115*C would still be pretty much straight up, and 125*C is pegged hot, in case that makes you feel any better.
I don't know what pressure 125*C correponds to with your antifreeze mix (50/50?), but your expansion tank has a 2-bar (about 30 psi) release valve. If the coolant actually got to that pressure, you would definitely see the aftermath of that sprayed out of the expansion tank cap.