zip ties, 1/4" wire loom, and those little terminal blocks that HL uses for the smokers. I bring the battery power to the terminal block, then power the board, fans and accessories off of that. I use very small fan that can blow on and cool boards in stock location on PZIII, Pershing, and Tiger. Less lazy solution for Pershing and Tiger hulls is to build a dedicated electronics tray but those tanks of mine don't need them yet.