The backlight on the red Taurus is broken, there is currently no backlight. And on the black Taurus it's the other way around, you can't turn off the backlight. The dimmer currently cause the small gauges to get brighter and darker but have no function on the large gauges and speedo in both Taurus.
The backlight of the red Taurus worked fine until the RT patch. Since the patch, the brightness of the small gauges changes and the speedometer remains dark. The black Taurus has backlight that cannot be turned off. There, too, only the brightness of the small gauges changes.
I just jumped over from the PS4 forum, to see if the problem is also on other platforms. Is it reported to DTG ? Tickets raised ? How many of us ?