I think I fixed the fuel gauge issue I was having, at least on the front tank.
I crawled under the truck with the brand new sending unit I bought for the other truck and verified the wiring and gauge worked as it should.
Then I grabbed a sending unit off a spare tank from a parts truck, verified that read as it should as well.
I swapped the two sending units out and I have to say, my friend was exactly correct on the "cause of death"
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I fully expected a wiring issue since the rear sender doesn't work either. Turns out it was just the float!
I tightened up the rear brakes today too. Seems they might need a little bit more but at least they're working now after having the drums turned true.
I think my brake vibration is the front left wheel but that's a problem for another day. I don't really feel like tearing into that today. I noticed one of the rotors had a blemish in it at install and I was already past the warranty period so I put it on anyway. My suspicion is that I'll need another rotor.