I have a 2000 Z3 2.3 with 46,000 miles. I just bought it one month ago and have only driven it about 500 miles. I started it yesterday after having it sit for 11 days while we were on vacation. After driving it a few miles, I noticed the speedometer needle was not working, everything else was working. I tapped the plastic front of the cluster, and a few seconds later it started up and seemed fine. Prior to this it had always worked fine. Any suggestions on cause, or what to do would be appreciated. I intend to watch it for awhile to see if the problem reappears before doing anything about it, but I was wondering if anyone had some information about this problem.