Here is the situation.

I just brought my car to the mechanic to have the motor pulled so that the oil pan could be replaced (leak). While it was there, the drive shaft was replaced as well as the pinion seal. All gauges were accurate and working when I dropped the car off. When I picked it up, the gas gauge is well past full and @ 3:00. The gas gauge light works but the gauge isn't. Where do I begin to troubleshoot? Could a fuse have been blown? I looked at the fuse panel and didn't see anything labeled gas gauge or something similar. I trying to rule everything else out before I drop the tank.

Thoughts?

Thanks,
Keith

check the ground by the tank.

thats sinks for both sides.
As a mechanic (and i have been there) when the customer gets the car back and something isnt working that was suppose to be involved in the repair,it can get stupid ugly and i never touched a thing.
Some shops would think the customer had the problem before and is looking for a freebee fix.Anyway as a shop/mechanic one has to do the right thing and at least look into it and see if it might of been caused by them dont you think?
I agree about the ground.
I'm going to take a guess how just for fun.
They did the rear seal/driveshaft.Right above that area is the ground wire for the sending unit.....probably a fresh cut wire is what you will find,when they removed the driveshaft they might of lifted the shaft in the rear and had to pull it out of the trans hard and the rear pinched the wire when it hit the trunk pan.Probably would of sent a ujoint cap flying also but you where replacing the shaft anyway.