You need to make sure its not the sender or a wire connection. Ground the sensor post of the gauge and if it pegs out it is good and if it does not move when grounding the sensor post the gauge is bad. I have never tried to use an automotive gauge their.
“The world will not be destroyed by those who do evil, but by those who watch them without doing anything” Remember what He has done and remember that He is not done yet! GOD IS GOOD