Have the famous fuel gauge issue. I believe it's a ground issue as it shows way over full.

Then speedometer is off by 10, don't know if that would be a ground issue as well, but I'm picking up both speed sensors this weekend.

Also my ac is non op which sucks in Texas. I turn it on the voltage drops. So either I have a screwed up compressor, or I have a restriction in the line. It holds a vacuum perfectly

Any idea where the ground for the fuel tank is

 

The first thing I would check is your charging system. Check all grounds, and look at connectors for corrosion.

Does the fuel gauge move at all? Or does it say that it's overfull no matter how much is in the tank? Is the pump itself working like normal? Are fuel pressures what they should be?

As for the A/C. When you turn it on does the compressor kick on? Is it fully charged?

 

Both tanks work perfect. The gauge doesn't move at all.

 

The compressor kicks on, and it's fully charged

 

i wonder if your floater fell off? could be!

theres a way to bypass the gauge.take cluster off and put black piece of tape across both black square lookin things.ive read this somewheres awhile back,and it works.it wont cause a spark so no worries there.

 

Then I bet you have a problem with the blend door not moving. Try pulling out the A/C fan from the box in the engine bay. Then start the truck and turn the AC on. Once the compressor comes on reach into the box and feel the evaporator to see if it gets cold. If it does then your blend door is the problem. If it doesn't then there's a problem in the AC system. But the fact that the compressor comes on and runs like it's supposed to leads me to believe the system itself isn't the problem.