Remove the gauges by reaching behind and remove the clamp in back, usually 2 thumb screws holding it. Remove wires. The clear cover usually is removed by bending tabs out of the way. Or by using a tiny screwdriver to carefully bend/prying the cover away from the casing on the back side. Not hard to do.
2015 Fleetwood Discovery 40E on a Freightliner XCS chassis with a Cummins ISL9 pulling 1 and/or 2 motorcycles, '07 Honda Accord OR a 17' Runabout Boat.