Everything is in the install guide.
As it says about the 3.5A for a screen:
"Table 2 contains power specifications for typical SkyView systems. The table below accounts for
the power that a SkyView display consumes while powering itself and its attached modules."
So the AHRS, EMS, and GPS are in there already.
The Transponder is 0.4A @ 12V. It's in the transponder section of the install guide.