it is located on the bottom end of the head
Could be a faulty temp sending unit.
Which sending unit? Oil pressure sending unit? Engine temp sending unit? Fuel gauge sending unit?
intake manifold
To fix the temp gauge check the temp sending unit first. A bad sending unit is a common problem with the temp system.
Your fuel sending unit is in the gas tank, mounted from the top.
THE temp sending unit 4 the inside gauge usally has 1 wire & the sending unit 4 the Computer has 2 wires.
Next to the thermostat housing.
it screws into the side of one of the heads.
NO they are not the same.
more then likely it could be the temp, sending unit. or a bad wire to temp, sensor!!
That is the temp. Gauge sending unit.
The temp sending unit may be shorted to ground. Unplug the sending unit to see if the gauge drops to cold. If it does, you have a faulty temp sending unit.