I'm curious where the actual requirements are for installing an IFR
GPS. My local A&P says he knows an avionics guy who is semi-retired. I
wonder if I could install a 430 in my KX-170B hole and have him sign it
off. Would Garmin or any reseller sell me a 430 directly? For approach
approval would the avionics guy just need to sign off the demo flight,
what really is the reg for signing off an IFR GPS install?

-Robert