That's an awesome picture. Unfortunately this rule was created around the time I posted a pic like that (not of my car but of someone else's) ...
"Posting pictures of any tach/speedometer at highly illegal speeds is not allowed. That is way too dangerous and just encourages similar behavior. It does not matter if it was taken at a track or any other place where such speeds are "safe", there is no way to tell that it was not taken elsewhere. Similarly, posting about your high-speed escapades on public roads is forbidden."