Wow, I just pulled the gauge itself from the panel and the discharge side of the unit INSIDE the panel is fried as well. I do not know if the hard plastic "boiled" up as a result of the short or if the gauge got so hot it boiled up and then grounded out against the case. It sure looks suspect to me inside. I have a great photo if you want to venture a thought. If I have this right in my limited understnding....... for there to be so much damage INSIDE the gauge and on the OTHER side of the terminal....doesn't that indicate the ground was created there. Otherwise I guess the heat of the short could have boiled that plastic. On the other hand, I can not see where there is any metal to metal contact?