The MGL iEFIS Lite has a built in AHARS, so that's one box removed.

You need a box (RDAC CAN) to wire up your various engine inputs and then that info gets transmitted to the EFIS display by a couple of twisted wires (CAN bus). There's no need to have a separate EIS because it's on the EFIS screen.

It's up to you whether you need or want to install a magnetometer (SP6). In the Kitfox this doesn't seem to be a problem because you have the removable wingtip fairings and that seems to be an excellent place to mount the SP6. For a Eurofox (my aircraft choice) it's much more of a pain in the butt because the wing is really the only place for it to go because of the steel in the frame and the fairings are not removable. This may create problems for me in the future for access but with the KF you are laughing. Of course, if you don't need a magnetic compass on your EFIS and aren't bothered about having a wind arrow then you don't need the magnetometer at all.....just fly on the GPS track line, like we do 99% of the time anyway.

As I said on the other thread, you can remote mount both the Trig radio and transponder and control them through your MGL EFIS, so get a really clean panel