Roy,

Now comes my question, what will I be allowed to use on my instrument
checkride ?

The FAA has recently changed its attitude on this. The key point is that you
will have to be able to use everything that's there. So you need to be
proficient in autopilot and Garmin use. OTOH, the examiner can declare broken
whichever equipment he wants to. That depends a lot on the mindset of the
examiner, and your CFII should be familiar with the quirks of the examiners in
the area.

I am assuming that the examiner will want the 530 switched off at some stage
for at least one ILS approach, while using the KX170B + GS Indicator ?

I guess so, too. OTOH, mine (in Germany) wouldn't let me program the 430 for
the approach, but he would still allow me to have the simple map display with
ground speed and track (yeah!).

--
Thomas Borchert (EDDH)