So this morning I saw, for the second time in 76,000+ miles the "dreaded" speedometer sweep to 100 MPH. The tach didn't move nor did the engine speed change. Stopped on level ground at a stop light so the clutch was in and foot off the brake. I tapped the throttle and the speedometer immediately came back down. Interesting to say the least, but frankly, for something that only occurs once every 18-20 months definitely not something to be wary of or worried by.