I have a 69 GTO and the last several cold (40 to 50 degrees) days I took the car out the Speedometer made a scraping like noise and the needle was bouncing around like crazy. It would go from 40 to 120 mph and back and forth. AFter stopping for breakfast the car sat in the sun and when I started it and drove on to the road the Speedo seem to work fine except for an occasional back and forth jumping. The scrapping noise also stopped or at least diminished quite a bit. I figure it is in the cable, maybe needs to be changed or lubricated. Could it also be in the speedo casing itself?. Any comments would be appreciated. thanks Soups.