Foggy instruments?

UngaWunga

Pattern Altitude
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Oct 27, 2014
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UngaWunga
What could cause an ASI and Altimeter to have fogged up glass, while the VSI looks clear?

I only have pictures, so I'm trying to guess what the problem could be. Doesn't look like condensation.

I figured that if it was something to do with the pitot-static system, the VSI would be fogged as well. But it isn't. This is in an older 172, btw.
 
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