<VV> Plastic or ?

[J R Read_HML]

My Rampy sports a Spyder dash.  Looks good in there BUT...  the head temp 
gauge seems to always collect moisture on the back side of the lens.  I 
suspect, but don't know for certain that the lens is plastic.  The Rampy is 
my only EM and I know the LMs have plastic lenses.  But since the Spyder 
lenses are flat, could they actually be glass instead of plastic?  I've not 
had the instruments out of the dash and don't really want to go that route 
if it can be avoided.

The reason I ask is that I'm considering trying to "cook" the moisture out 
of the instrument with a hair dryer from the front side.  I don't even know 
if this will be a permanent cure and I'm concerned that I could distort the 
lens if I get it too darn hot.

Has anyone else had a similar problem and - is so - what was your cure?

No, the windshield gasket is not leaking.

Later, JR
'61 Rampside Standard 4/110
'65 Monza Convertible 4/140
'66 beater Coupe - "icemobile" 4/140