I recently changed the tank in 08 Chevy Silverado 2500 HD. It went from the stock to a 46 gallon one but now the diesel meter is not marking right. Says it's at end when the tank still has at least 15-20 gallons left. Called the guys who did the job and they said they don't reprogram. Anyone no where I can go?

 

I would get ahold of whoever you got the tank from and see if they offer a different sender, programming isn't going to change where the sender physically bottoms out

 

Maybe your new tank is deeper and the float level won`t reach the bottom.