Koso gauge coing crazy on hot sunny days

[rodneya]

My Koso gauge looses the plot when it is hot and sunny and becomes unreadable. The numbers turn into unreadable hieroglyphics with lots of blank spaces.
Anybody else get this?

[m in sc]

ive never had a digital gauge go crazy int he sun. ive never had a koso unit speedo/tach so cant speak to that. i have run koso gauges like temp etc and they always did fine.