The new HUD will work without the Cessna Radio stack. I put it in the panel.cfg because I knew a lot of people have it for the reasons Voodoo mentioned. Besides it is the only way to enter a NAV2 frequency. The Acceleration Hornet UFC allows only NAV1 frequency selection.
Edit: In addition, it's not a problem if you have 2d gauges in the panel.cfg that you don't use. As long as they are not opened (with a Shift+ combination), they are not loaded and are not calculated, so they don't slow down the sim or anything. Only gauges in the virtual cockpit are loaded automatically.
