I've been chasing a dashboard vibration noise on my GT. Searching this forum and others, I come up with several possibilities including the instrument bezel, roof pillar, etc. Mine seems to be coming from very near (or inside) the gas gauge. I removed the instrument bezel and drove around a while, it still does it. The car must warm up a couple minutes (heat is on) and it happens most at around 2900 RPM but also sometimes up toward 4000 or as low as 1500. Accelerating seems worse than steady speed. The air vent near the A/C switch is an obvious suspect but touching it anywhere including inside the dash doesn't stop the noise. Any suggestions welcome -- I'll post updates at
http://vibeowner.home.attbi.com