I have been reading this with interest, my gauges haven't misted up at all until maybe 2 weeks ago during night driving, they had been fine all evening, then suddenly misted up, only gauge that doesnt seem to suffer is the rev counter,
Mentioned this to BHM, a known issue and the only fix at the moment is to direct the heater output to the back of the dash, they have tried drilling holes but without success apparently, maybe it varies car to car? Disappointing though as none of my classics suffered with this issue.
I am not feeling brave enough though to start taking my dash apart so may just live with it.
