I frequently lay out an instrument panel on paper. I drill holes for the instruments in the plastic panel, and lay that over the paper. I drill the panel first, then put a piece of paper behind it. I then trace the plastic panel, including the holes.
I have built up a folder with instrument images, using a google image search. Search for airspeed indicators, altimeters, turbine temperature gauges- all the instruments you find on panels. Use your graphics software to size them to 3 inches in the scale of your model, and glue them over the circles on the paper layout- or print them on label stock- no glue needed. But if you print them on glossy paper you do not need to overcoat them as described below.
After gluing the plastic panel over the paper layup, I put a daub of window glue/transparency cement, like the Micro Scale stuff. This simulates the instrument cover glasses. BTW, the CRT screens just need a grayish-green color.