I noticed a while back that some vintage/veteran bentleys had reverse speedometers and from time to time have noticed that some other early sports cars had reverse wind speedometers
from
http://www.dailymail.co.uk/news/arti...s-sat-nav.html
Having seen a few of these I formed the opinion that the reverse wind speed in Cobras was a nod to early performance cars.
I think the format originated from early airspeed indicators and the connection may have suited those car builders - not sure about that tho...
LoBelly