The glass on my S2 speedo is dusty and is much more prone to condensation than the tach glass. I was thinking the gasket around the bezel may need to be replaced. Can the bezel be removed with the speedo installed? Is this as simple as unscrewing the gauge bezel, then cleaning glass and replacing the gasket, or is the process more elaborate? Any other causes/fixes for condensation within the gauge? Thanks much!

 

That's what I did to clean the glass on my Series 3 tach and speedo. You will need to remove the instruments to unscrew the bezel. IIRC it's only about 1/8 turn counterclockwise to remove the bezel. I found the gaskets online but unfortunately that was some time ago so I don't remember where.