If I was bothered by this problem I would be inclined to pop a 5mm hole in the back of each gauge to equalise the internal to external temperatures more readily, thus avoiding the condensation.
Simples...
I did........., but no effect!
Ruut Bianchi Morgan PlusFour 2023 Bentley Midnight Emerald Morgan 4/4 4-seater 1990 Royal Ivory