Re: Check engine light on with the following codes...
For future reference: You can continue to update one thread. We don't need 3 different threads about your CEL.
Now, on to trying to be helpful:
Those are all oxygen sensor codes, it has nothing to do with your fuel line. It likely doesn't have anything to do with your recent gauge installation, either.
Kinda curious that you've got both sensors gone at once, though.
Check all the fuses and make sure you didn't blow one (I don't even know what fuse these'd be on), but I'd think your problem isn't anything you caused. I'd also consider clearing the codes and seeing if they come back. If they come back and you're still under 80k miles, take it to the dealer, emissions components have an 80k mile warranty.
Side note: Running the truck down to empty won't throw CELs, nor will it burn out your fuel pump, it's made to do that, you'll be just fine.