This is how I did mine...http://www.akff.net/forum/viewtopic.php?f=3&t=53456
In hindsight I would not have gone for the Tallon but not just because it was incompatible with the DSI, but because it requires too many holes that are too big in too small an area. I don't expect it to be a problem, but if I want to change up later on it might be. Plus, I'm a perfectionist.
Otherwise, I wouldn't change a thing about the way it's wired, the scupper mount transducer or the battery box. So far it is robust and water-tight.