I was hoping that there would be a reversion function like we have in the bigger aircraft between of two screens on the D-10 and the D-10A. I know now that this is not the case. So I cannot see the Artificial Horizon on the Engine Monitor or vice versa.
Brian,
You CAN see the AI on the EMS and the EMS on the AI. But this is when everything is working fine. The EMS doesn't have attitude sensors in it, so if the D10A fails, the EMS has nothing to display. This is actually no different than a G1000, which in most installs has only a single attitude sensor in the plane. If this fails, you have no attitude, no matter how many screens in the plane are still functioning. This is why many certified G1000 installs require a backup attitude indicator in the plane.
Redundancy is a complex topic, and we try and take a very conservative line. As mentioned above, it is possible to have a failure on the EFIS and still see data on the EMS. We probably see this failure less than 10% of the time we see a failure in a unit. So it's not great protection, and not what we like to call redundancy.
If you really want redundancy in a Dynon D100/D10 system, you want to buy a D180 and then a D10A or a D100. This gives you totally redundancy in your attitude, since two totally separate boxes provide that information. No one failure can take away your attitude/airspeed/altitude/etc.
As Dan mentioned, SkyView is coming soon. You can get redundancy in this system as well, but the smallest screen in SkyView is 7" and there's no redundancy without two screens, which doesn't seem to fit what you need. I do promise you can fit two 10" screens in a RV-8 if you really want to, so there's more space than you may think in your 3. If two 7" screens are an option for you, SkyView might be a really great solution. One nice thing about SkyView is that you can add redundancy in the future, since it uses networked sensors instead of sensors in the box, so if you decide you need a second or even third ADAHRS in the future, you can purchase just that and add it to the system.