I have never actually flown or seen one of these but I'm working on the CFII and have a question about it: in 1-1-11 it says that "both lateral and vertical guidance may be displayed on conventional course deviation indicators..." so does that mean a non MLS-equipped aircraft could tune in the MLS frequency and fly it as long as it has "conventional course deviation indicators" (which I'm assuming is just a VOR with localizer and glide slope needles)?

I know this is not a very exciting topic to waste your days off talking about but thanks for any help!