OK, DH is leaning towards the "replace #2 OBS with something more
modern" option.

Which brings us to the question:

I know the KI-209a will accept input from a GPS.

Is that just for the left-right course deviation indicator, or
is it set up to accept input to the glideslope as well, for use
w/ VNAV? Anyone know?

Alternatively: is the output from the glideslope receiver/input
to the glideslope portion of the CDI some sort of funky King
signal which the CDI has to decode, or is it straight analog?

Thanks!
Sydney