I noticed a few months ago that my Gallardo overestimates the speed by about 10%, by comparing it withg the GPS speedo. I was suprised by the amount of error. Even with an analague speedo it should be possible to get within say 6%. As you say, it looks like the speedos aren't calibrated even roughly. Pretty poor in an expensive car!
When I was trying to go as fast as I could on an autobahn recently the speedo would show a magnificent speed, but the GPS showed that I was actually doing about 15mph less than the speedo showed.
Are the speedos analgue or digital. Yes the dial is an analogue needle, but my guess would be that it is powered by the pulses from the other speed sensors.
And is this all just slack calibration on Lambo's part, or are they trying to impress drivers with the great speed by deliberately "forgetting" to calibrate the speedos. Either way it's a bit disappointing.
William