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I got my sounder finished. I would have posted this earlier but my internet has been down. Turns out that second electrical kit is not required. If you wanted to save some money you could easily splice in the sounder wires to the data link connector. All this kit does it make it easier and cleaner connection. Here are some more pictures from the install.
Here is a pic with the top off...
Here is a pic of the electrical accessory kit, it adds this fuse box and you connect the wires into the back of it...
Here is a pic of whats actually in the fuse box, as you can see it is just four bus bars that connect the sounder to the data link connectors wires, and it adds a fuse for protection...
Here is a picture of the sounder clipped into the bracket that screws into the hull...
So all in all it is a very simple kit to install. You wouldn't need much mechanical aptitude to install it. Plus it is all plug and play, no programing. Once I made the connections the option automatically comes up in the menu next to RPM, HOUR, and SPEED.