OK, I am making progress. This is all new to me. I have followed all the instructions up to step 3. First, the good news. The G5s work fine as pop outs. The bad news is that they still don't show in my panel. That must be what happens in step 3.
In your cockpit object (where all your manipulators are), the display texture will be needed. (Q: how do I add display texture?)
Match the UV coordinates of the rectangle to what is set in your acfConfig.cfg (Q: what are UV coordinates and where do I find them?)(Q: I don't see anything called UV Coordinates in the actConfig.cfg file either)
Add the commands for the knobs (A matches for PFD unit, B matches for HSI unit): (Where do I add the commands for the controls? Is this just adding to keyboard or joystick controls? or something else?)