2 and 3 is the same bonus, at least as I read it. They are in different sections of the book, yes, but the entry on page 433 does not stack with the entry on page 176, it refers to the same bonus.
That's how I've always played it, anyway.
Again, at my table a character that takes three sequential Take Aim actions followed by a Fire Weapon action with a wireless enabled smartgun weapon would get +3 Accuracy and +3 dice pool from the take aim actions, in addition to the +1/+2 dice pool bonus and the +2 Accuracy bonus from the smartgun system.
It's also worth pointing out that if you use a multiple attack action and you're using multiple weapons, you cannot benefit from a smartgun, wireless or not.