[nemo]

Is it possible the source used is fuse. Use a multimeter to check if there is still have 12V coming to the meter and the ground is still good. A 12V light bulb can be used to test if you don't have a test meter, just place it across the two leads. The odds that the gauge has an easily replaceable fuse are slim, if it's digital it may have a solder in component used as a fuse on a circuit board. It can be tiny, usual the first device on the positive, sometimes negative side. Good Luck.