Would you fly this airplane?

Do you have enough gas to fly the airplane ? Yes. Is it legal ? No.
Does anyone know ? Yes. That's your biggest go/no-go problem at this
point.

Seriously, if this is your airplane, try wiggling the trim pot on the
back of the gauge and give it a shot of corrosion-X. Corrosion buildup
on the pot contact is common, resulting in jerky movement, indication
that comes back with tapping on glass, etc. That's not legal either,
BTW, so don't tell anyone you did it !