TEMPERATURE AND GAS GAUGE NOT WORKING-HELP

My money is on the Voltage Regulator... coincidentally I just pulled my gauges out this weekend, but in my case the PC board was burned-out. I soldered a jumper in place to patch it. Haven't yet re-installed.

That is a weird voltage regulator. I'm assuming it's mechanical inside of that metal box. Mine seems to work (according to the factory repair manual). It pulses from 0V to 7V.