a knob assembly includes a repositionable knob having an interior framework and a light - transmissive indicia , at least one light source for projecting light into the knob to back - illuminate the indicia , a position sensor for providing an output dependent on the position of the knob , and a controller receiving the output from the sensor and controlling the intensity of the at least one light source to compensate for any light blocked by the interior framework , and maintain a substantially uniform illumination of the light - transmissive indicia so that it is viewable from the exterior of the knob .