Speedometer - '86' 420SEL
All fuses are new and have been rechecked. The previous owner alleges that this car had been in use and not just sitting. I'm not sure about allot of things this guy told me about this car and it's care. All other gauges in the dashboard are working just fine. The speedometer remains on "0", when I drive it. Could something have wiggled apart? If so, what? Is this job a DIY?