Garmin G5 AFM Suppliment 190-01112-13
Alan,
The answers to your questions can be found in the Garmin G5 AFM Suppliment 190-01112-13 and the G5 installation manual. Both of these doucments list the apprved configurations for VFR or IFR use of the G5. Also, you do not need to ammend your operatining limitations for your RV-6, the Garmin supplimental AFM for the G5 takes care of that. You should also have a AFM suppliment for your Garmin 430. Remember, as non WAAS GPS navigator, you cannot use the 430 as the sole means of navigation without an additional nav aid as a back up.
I am sure someone will say that the AFM suppliments do not apply to an EAB since you didnt use the Garmin STC for the install, but the AFM suppliment is the best info you are going to get as far an approved configuration to meet FAA reg for IFR ops.