[C320-list] Wind instrument installation

[Ben Waltuck]

Can anyone share the experience/cost of installing a masthead wind 
instrument?
The boat show is here in Boston tomorrow, and I'd like to purchase a 
wind instrument, but I'm a little curious on the installation..
Is there a conduit in the mast where I will be able to easily feed the 
wire(s)?
Can this be done with the mast up?
What should the approx. cost be to have this installed by the yard?
The Raymarine wind instrument seems like a safe choice, but I'm also 
interested in the newer ultrasonic units as they have no moving parts 
and offer more information (like temperature and humidity) like this one
http://www.defender.com/product.jsp?path=-1|344|295761|320707&id=605649

I'm also considering getting the ST60 multi-pack with wind, depth, and 
speed.. as I only have depth today.
I'll need to install an through-hull transducer for this and I'm 
somewhat scared about drilling a hold in the bottom of my boat.. is this 
more or less complicated than I think?  Again, does anyone have an idea 
on what the cost should be to have this done by the yard?

Thanks!!

Ben Waltuck
Getaway 352 ('96)