So while option two may be the factory "approved" method mine came with dual batts and no sensing relay, just a Perko switch. Hence the reason i yanked it all and added the Blue Seas setup.

Having a switch wether one is cheap or not is a must have as it allows the batteries to be disconnected from the electrical system while the boat is sitting and eliminating the possibility of an electrical fire. Many a fire a marine fire has happened due to this very reason.