I get rattles in mine. Are you sure its the dashboard though? It could be a number of things. Check all the panels in your car.
One time I had a terrible rattling for a week or so. Drove me nuts! Found out it was a writing pen in the door storage compartment!

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All show... So far.
Exterior: Roush Front Fascia w/o chin spoiler, Black Billet Foglight Delete Grille, hidden smoked foglights, GTS Blackout Panel, smoked tail lights, WebElectric Sequential tail lights, MUSTANG 3rd brake light, 14" Shorty Antenna.
Interior: Red piping, RVinyl Aluminum Dash Kit, CDC Aluminum Pedal Covers.
