Number one gadget was the Mercury Vessel View Mobile, but the dealer did that. I only had to link a device to it by Bluetooth. I had planned to use a 7" tablet for that, but there may not be quite enough room for one. A cell phone is the next option. Either one gives me GPS mapping.
I have ordered the following:
Prop Alert Safety Cover
https://www.thepropalert.com/
Rod Tamer straps
https://www.tacklewarehouse.com/T-H_Mari...THMRT.html
miscellaneous stuff like a

lock, lure holder, and marker buoys.
Like almost every other Classic buyer, I'll be upgrading the entry-level Lowrance finder, likely with either a 7" Lowrance Elite or Reveal with side imaging. And as soon as the factory batteries die, I'm going to get Ionic lithium ones. I already have a two-bank onboard charger installed. I'll also get a handheld VHF radio and spare props for both motors.
I stopped in at Fred's Marine Monday to see what they have. Got lots of help there and took home a catalog to finalize what I want. I expect to order one soon.
I am very happy with how I was treated at Fred's Marine. My guy is Andrew and he was extremely helpful throughout the many months of ordering and waiting. Be prepared for a long wait; Covidiocy has really hit boat production hard. Fred's hasn't gotten a Tracker Pontoon boat in more than a year, as one example. If there had been a boat show this year, they would have been hurting for anything to show.
I got my Classic earlier than I planned only because somebody else canceled their order. Still haven't gotten it wet - but soon! The first three hours of motor break-in will likely be done circling Willard. With me dressed like an Eskimo. LOL! At least the ramp will be empty for me to learn launch and landing.