Don, it's useful to be able to remove the panel you describe, to trouble shoot the level indicators, change a bulb, or adjust the calibration of the inside/outside thermometers. The panel is held in place by about 6 large spring clips, attached to the edge of the panel. The panel is levered out. I take a stout knife blade with a rounded end, and lever from the centre of one end. When that pops out (be brave!), the rest will spring out more easily. It seems rather brutal for such complex circuitry, but wait 'til you see how to put it back! Lay it in position and shove it with the heel of your hand by each clip, one at a time. Mine goes back with a loud snap, which seems to cause no harm. I've had this panel out more than ten times over the past 4 years. Bon courage! Nick.
Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
"The price of freedom is eternal maintenance."