I'm interested in that too. I've arranged to borrow a mate's one and it has a sucker tripod mounted thingy which he has used successfully in the past.
What is the go with these things? I am quite keen to have some footage with the tacho and speedo in the foreground (even if it only has a max of 5kRPM and 100mph

)
Can we have some sort of direction on this. If they aren't allowed then it would give me some time to sort out an alternative mount or whatever ...
Cheers,
TP