My Temp Gauge and Fuel Gauge aren't working...

Just so you guys are clear... An ammeter measures Current in Amperes (or Amps) whereas a voltmeter measure Voltage in Volts. Older Mopars all had ammeters in them to let the owner know if there was a positive charge of current going to the battery or a negative charge of current being drawn from the battery. Newer Mopars used a voltmeter to simply monitor the battery voltage. If it dropped below approx. 12vdc you pretty much knew you weren't charging properly. The problem with older ammeter systems is that they are in series with everything else and if any part of the series system opens or becomes resistive then you get a voltage drop (usually seen as dim headlights) so that is why Chrysler used a voltmeter in later years and did not run all the current through the firewall and up to the instrument cluster.