Low coolant level which causes an air pocket in the engine.
More likely the temp sensor has gone bad than the gauge is actually bad.
There is no reset for the fuel gauge. The sending unit in the fuel tank has probably failed.
Can be a defective temperature sending unit. If you just chance the coolant can be air trapped in the cooling system. You would need to bleed all air from the system. Can also be a defective gauge, but highly unlikely.
mostly likely something wrong with the sensor or gauge.
This is not a job for a novice as much can be harmed when working with the printed circuit etc. Take it to a garage.
No - the gauge reports 'real-time' the engine temperature. If it is wrong, there is a problem with the sending unit on the engine. This is a pretty easy fix...
Well, assuming your fan is operating normally, it's possible your radiator is plugged up, either internally with gunk, or externally with dirt, bugs, and fluff.
There is a battery light above the engine temperature gauge
The system has 2 valves, like car tires. The recharge can(s) have a fitting for these and probably a gauge. One will be on high side and one on low.
i dont really know but i think it is 700k? i d k you tell me
I believe that is Motorcraft DY961
On a 2002 Mercury Mountaineer : The " check gage " light comes on if the engine coolant temperature is too high , the engine oil pressure is too low , or the gas gauge is at or near empty