Follow the above advice to test the gauge and sender...I just want to add that I had my gauge peg out once while I was driving...dont know why but I just happened to see it happen...needle dramatically went full right all of a sudden...stayed there for about 5 seconds, then the needle fell to 0...the sending unit AND the gauge were bad by then...I am guessing the sender fried and then took the gauge out.
Just sorta sounds like what I had happen...when I read your incident that is...so maybe both of yours are bad.
Lord send your Holy Ghost into our hearts and make the desire of our hearts Your Will.
Pro-choice, that's a LIE, babies don't choose to die!!