Although Ferrari instruments are not noted for their accuracy the fact that the speedo and usually tach needles as well, stop at the lowest mark above zero is just a long standing tradition if you will and has no relationship to it's innaccuracy except accidental or coincidental in nature.
Okay, thanks for the replies guys. I think Pete answered it with what I expected. It really does not seem like I am doing 40 when the needle says so, so I'll assume that being stuck on 5 mph is a deduction of 5mph off of the actual registered speed.
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