In my opinion, if you're looking to get your boat on the water in time for your upcoming vacation......stop everything else and concentrate on getting her running right. In the end, that's what matters most....(needing solid electronics are part of that, but still fall second to reliability while out on the water with your family).
There's only one thing worse than having your boat fail while out on the water....and that's having loved ones on board when it happens........that's why I mostly invite people I don't care about out on my boat...