Sounds like a burnt amp guage to me. Check your firewall multi connector where the fusible link goes in for voltage.If you have it going in, then check out a wiring diagram in a manual and see which connector the voltage comes out from the dash and check that. If you have no volts coming out you're amp guage is probably burned or the voltage regulator on the dash panel is burned. Check out Mopar Action tech questions for more details.