You could use a Fuzblock - FUZEBLOCKS.COM and wire direct to battery. Pick up the trigger from a switched fuse in the main fuse box or taped into an accessorised source such as the 12v power socket.
While not sure you want to do it, you can have direct or switched power from the Fuzblock depending how you orient the fuses.
Denali also make a similar product - Powerhub 2
Bookmarks