The method of mounting aircraft instruments in their respective panels depends on the

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Mounting method is determined by the instrument case design because each instrument is built with its own mounting provisions—such as studs, rear mounts, or flush-mount features—that the panel must accommodate. The panel is cut or prepared to fit the exact case and to ensure proper alignment, clearances, and vibration isolation. In short, how an instrument is secured in the panel follows the case design first, since that sets the hardware and mounting points needed. Wiring layout affects how things are routed and serviced, not how the instrument is physically attached. Pilot preference isn’t a factor in the standard mounting method, and while the aircraft type can influence overall panel layout, it doesn’t change the fundamental mounting approach dictated by the instrument case.