Noisy Speedo

[beanie]

I have been trying to research on message boards...but have only found speedo and tach replacement info/articles. The speedo on my 93 SSP makes noise above 40 and gets a louder as the mph goes up. It sounds like the gears inside the speedo are rubbing on something as its spinning. I had a 89 non-ssp that did the same thing. Do I need to replace the Vascar? or can I take it apart and 'lube' it up somehow or another? The functionality is fine, its just noisy. Any help would be appreciated - I was planning on just taking apart the dash and cracking it open to try and get some intel as to what is rubbing.