First off its important to clarify that the Switch-Pro already includes a 2' power cable w/ 100A inline fuse. This cable is long enough to reach the unit on the PowerTray from the factory battery location, but its tight and has to come up from the side. (see last photo)
So if you're powering your Switch-Pro from your factory battery then this is just an optional power cable that is 6'' longer so that you can come up from the back of the tray. Also it's a black cable wrapped in Tecflex w/ red heat-shrink, so it will match any other cables coming from myself or Off-Grid Engineering. For this cable a single MRBF terminal fuse holder w/ fuse (100A for the SP8100 and 125A for the SP9100).
If you're coming from an aux battery on the passenger side then a 5' Power cable is required to reach the Switch-Pro unit. For this cable a dual MRBF terminal fuse holder is needed. The OGE dual battery "Split System" already includes a Single MRBF terminal with 200A fuse that is used to run the batteries in parallel, so to also run power over to the Switch-Pro a Dual MRBF terminal is needed to replace the single MRBF Terminal and add one more fuse because you should already have the 200A from OGE. You can choose between 100A for the SP8100 and 125A for the SP9100.