I brought my 56 Chevy pickup out of a 3 year dry heated storage, no gas in the tank and no battery. After adding a few gallons of fresh gas and starting it up the gas guage pegged itself on full, then danced around a bit, then read just above empty (which was correct), then pegged itself on full again. So..would this be a lack of power or bad ground? Also..temp guage shows no sign of life. Any ideas?