Another option for the airspeed switch is an inexpensive vacuum switch
from world magnetics about $15.  come in various types (speed ranges
and connections.  The one I have is set for about 80 kts.
They are inexpensive enough that I bought one as an extra - haven't
needed it.  They seem to be pretty well constructed.
http://www.designflexswitches.com/   (PSF1039061902)

Dan Ballin
LEG2  N386DM