There was kinda cool weather for this time of the year here at SF bay area. With open windows and roof I turned the heater on. After a while I noticed that there was a moisture condensate on the back side of the tachometer gauge glass. Is it normal? Did anyone notice the same thing on their cars?

 

Sure did. A good day's drive North I had the same experience in Vancouver. Five minutes after the heater kicked in the humidity improved and the mist disappeared. Is life just like that?

 

Well...life inside of THE 993 is different...I expect the phisic laws don't work there

 

I must admit I was very concerned the first time my tach fogged. Sputnik has described the experience very well.

 

Yes - This happens to my car occasionally in the winter, heater clears it pretty quickly though.

 

Ok, so we aren't alone...any solution?

 

On an earlier post, someone suggested drilling a hole or two in the gauge to minimize temperature/humidity differences with cabin air.
Sounded too drastic for me.