The mod provides a choice of interior cabin lighting: blue, green, orange, purple, red and white for all standard and some mod trucks.

The backlight is available in the “Driver’s plate” and “Navigator’s plate” sections.
On with dimensions: the backlight works when the parking lights (dimensions)
are turned on. On with the flashing light: the backlight turns on when the flashing lights are turned on.
The backlight is only visible when it is dark outside your truck.

Make sure that in the settings:
The “Light range of visibility” is not disabled.
The “Additional car headlights” checkbox is selected.

Added support for patch 1.59 beta

Credits:
Eddie Yantz