Have trouble with gauges. Q?

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I have rebuilt my gauge cluster. New circuit grid on back. Had my amp meter converted to volts. Have my tach hooked up to hei dist. All new wiring and led bulbs... I'm having trouble with the temp gauge and fuel gauge. They are both factory units and work fine out of the truck. The temp gauge flips straight to hot when the key is turned on... Then the fuel gauge started at full and goes straight to empty. I took the cluster out and reset both gauges fuel to full and temp to cold. Turn the key on and they flip to opposite position.
My question: Is there a possibility that the cluster panel is getting grounded out and those gauges are malfunctioning?? I know these two gauges are on a ground loop....
Any help would be appreciated.
Thanks