He is going to have to get the aircraft IFR certified either by the FAA
or a DER. There was a fellow in southeast Ohio that had a Pitts S-2B IFR
certified by a company in New England. This was 15-20 years ago.

Ed Sullivan wrote:
A member of my chapter has asked me as tech councilor what
would be needed to assure that the installation of a Garmin 430 in his
RV-8 would be legal in the eyes of the FAA for flying approaches. This
falls a bit out of my area of expertise. Can you help or direct me to
help.

Ed Sullivan