I think I smoked a amp gauge!

I have had almost the same problem with my 66 Dart. I would first check the connection at the gauge, and then see if you have power to it and on the other side. If the gauge goes out you will lose all power. Had that happen to me one night when I went to a cruise. I ended up by passing the gauge so so i could do the cruise and get home. Hope this helps and good luck with it.