1983 911SC Speedometer Repair Source and Door Window Support

Vehicle Information: Model: 911 SC; Year: 1983; Body Type: Convertible; Total Mileage: 76,000;

1. I have been having speedometer problems (I have consulted youbefore!). It stopped working, along with the odometer, so I replaced thesending unit. Unfortunately, this did not work. My next thought was tosend it to a VDO shop for repair. The only ones I've found are inCalifornia. Could you recommend any closer? Or anything else to trymyself? I am in northern Indiana (Not far from Chicago).2. My drivers window recently collapsed. Upon removal of the door panel,I found a deteriorated track (?). The metal runner that the bottom of thewindow rests in had basically rusted out, and broke, so the window wouldnot stay seated in it. I think I've found a replacement part fromPerformance Products, but am going to shop the used market a little.Could you tell me the specific name for this device? Do they vary fromyear to year? Finally, how difficult is the replacement?