I spaced mine 1" and would do it again. One group with switchguards is on the left side together with the ELT controls, out of passengers normal reach. These are normally not used during flight. A second group is in the middle of the panel and these are used during flight - like lights and others.
All other things regularly used during flight are located somewhere in the center of my panel.

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RV-7 flying, IO-375 w. P-Mags, 200RV Prop
RV-8 flying, IO-375, P-Mags, 74RV Prop
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