Mark,

The 430 does not have a glide slope. It is not certified for use in
precision approaches. It does have a page that will show you the CDI
for tracking VOR and Localizers, etc.

Are you kidding? Of course the 430 has a glideslope receiver. It doesn't
have an INDICATOR, but that's a different thing. You need a separate CDI
indicator anyway to be certified for IFR approaches - the built-in page
won't do. That CDI/glide slope indicator may contain the required
annunciators, too.

Is this one piece of equipment enough to enable my 172 to be instrument
certified?

Well, here you have to be careful. There are some who will argue that
you can legally fly IFR with nothing more than a hand-held GPS unit.

I don't think so.


You can review FAR 91.205 for required equipment and instruments, and
specifically sub-section (d), which covers IFR.



Yep.
--
Thomas Borchert (EDDH)