Now a new idea... from old PORSCHEs...

Sounds logic.

Problem 1) a windy situation behind the dash (always in Morgans)

Problem 2) great temperature differences (always in Mogs)

Problem 3) a lot of dust

Problem 4) the instruments are not dustproof

This points causes dust on the backside of the instruments and the surface grows up with a difficult sensitive for different temperature.

To sort the problem it helps to open the instruments and clean the backside of the glass from time to time.

:-(

Greets René

2018 plus4 (sports green)
with a homemade really shiny red tinted dash…