So my GT4 decides to punish me for spending way too much time on the 911 this week. Yesterday I took the Ferrari to work and on the way home the speedo crapped out. It is now showing 140 MPH while the car is sitting in the garage. It will still move if the car moves but my math is bad and I can't mentally subtract 140 from the indicated speed all the time - not to mention the speedo only goes to 160 or so. Before I tear into it, what are some hints? I hate tearing into this dash, it is not the most elegant designs.