Bonanza "Landing Gear Safety System"

My club recently bought an S35 Bonanza with the optional "Landing Gear
Safety System" installed. I've got the POH supplement that describes
its operation, but nobody seems to know much about how it works.

The gist is that when the airspeed and MP go below certain limits, it
automatically extends the gear, to help prevent accidental gear-up
landings.

Our Arrow has a similar sort of system which works off a 2nd pitot. I
don't see any such 2nd pitot on this plane, so I don't know where it
gets its information from. I could see it having some interconnection
to the throttle knob so it can estimate the MP (and the POH hints at
this), but it also appears to work off airspeed. I can't imagine it
having a mechanical pickup off the ASI.

Does anybody know how this system is designed? How things are
interconnected to get the functionality?