Purchased the Sport EFIS and Remote EMS. The EMS box can mount remotely behind the panel with signal wires through firewall to engine. . The data will be fed to the Sport EFIS, along with pitot and static. I think the Garmin 220 radio can be driven by the EFIS as well. But it is not required to. We will also have a Garmin 796 for navigation and standby gps instrumentation. We own this already. The 796 will not fit in the panel in portrate mode so we have elected to mount it against the panel but not in it. Not as neat, but more functional for navigation. No transponder or ADSB until flight test complete. Remote mounted so no need to plan the panel for them, only wire runs need be planned.