Oldfart
FRF Addict
You would notice it if it happens like mine. If I am in fairly bright sun and it darkens, you really can't see anything. It doesn't just look a little dimmer, it looks like you turned off the dash.I haven't really noticed any issues with my headlights or dimming of dash lights, but maybe it's something you don't notice if you aren't looking for it. But I have a clear ceramic tint, which is supposed to block infrared and UV rays to reduce heat, but not visible light. So I wouldn't expect any issues with the sensor on the dash.