My 2007 silverado 1500 in the last month has had the tackometer,horn,fuel guage and air conditioner quit working. I've had it to two general mechanics and one air conditoner company. They could not figure out the problem. Anybody out there had the same problem that could give me a hint on what is possible wrong.

 

I haven't had experience with your truck in particular, but I came across a Trailblazer a few weeks ago where the A/C quit working and the ABS/Brake light came on at the same time. It was an ignition switch - not the actual part where you put the key, but the electrical part. Just a guess.