Recreational Vehicle Lpg Tank Valve/gauge problems of the 2014 Toyota Sienna

There is no illumination of the main dashboard display-speed, rpm, temperature and fuel level when light control is at off or drl (driving lights) position. I went to dealer and service man said that is the way it is and another new vehicle on their lot was the same. The gauge lights are on but dim in parking and headlight position. (Toyota manual says use drl in daytime to save fuel and eliminate chance of burning out driving lights. ) I called Toyota and they said after 2 weeks of investigation that this is the way it is. This is a safety issue because we cannot see the speed on cloudy days or with sunglasses on sunny days. My previous Toyota- 2006 Sienna and 2013 avalon have illumination anytime the ignition is on for driving. When you can't see the speed easily, this is a safety risk- there is no digital display of speed on this vehicle.