Well I just can’t be sure of any switch being what’s with the kit. So the kit, some 8 ga wire be ok...it had 10 on the diagram but should some of that be heavier or does it all need to be a certain thing?Add an isolator like everyone else uses or purchase an ACR from blue seas systems to support charging auxiliary. You will love the switch for combining both batteries but still need to decide on how you want to charge auxiliary battery