Marbles,
assuming you're intent is to switch a nominally 12Vdc, like that generated by your preamp, use any switch that strikes your fancy or is easy to mount.....
You are not switching a signal of any substantial current, even if you're synching 4 or 5 components to it. There is no need for an automotive or marine switch, as you're not passing a 60amp surge current. Typically, a 115Vac switch, specified for some maximum current, would be specified for that same current at 28Vdc.
Anything in your junk drawer, or available at RatShaque should suffice.