2001 Ford Taurus gauge problem

I have a 2001 Ford Taurus with 86k miles. There is a problem with the fuel and temp gauges. They were working fine, then as I was driving, they just got stuck in position. The needles don’t move at all. They both broke at the same time and are in the same gauge pod. I’m thinking maybe a bad ground? Or fuse?

Any Ideas???

These gauges are tied to a voltage regulator in the dash I believe. I would suspect that the regulator is the trouble.