I use a universal car mount that I bought at WalMart for my 5" Dell Streak.
It has geard side pieces to adjust to the width of the device and swing out
"feet" to support the device from below. I also use velcro on the back just
to be sure, and it's never come out of the holder.
To attach the holder in the cockpit, I cut off the car mounting base and,
using 2 Adel clamps, attached it to the side of my panel where it is
securely held and does not block any of the instruments. Of course, a 7"
device might block something.
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Hi guys
Can anyone share some pix on how to attach a tab to the cockpit? Do you
make use of a normal cover and just velcro the back to the cockpit or
would you suggest making a pocket for it to fit into to keep it safe?
I've recently bought a 7" tab that I wish to use with XCSoar.. don't want
it to fall off the cockpit now.. 
Regards,
Bruce