Not sure where exactly to post this so I'll do it here. I live in Idaho and most mornings this time of year are in the teens or single digits. I have a 1959 Chevy Fleetside as my daily driver. On these cold mornings my speedometer makes terrible noises and reads up to 50 mph too high (on really cold mornings it pegs out at 100 when I'm only going 10 or 20). Once the heater warms things up int he cab it all returns to normal (no noise and correct reading). I've taken it apart and all is clean and well lubed. On a recent very cold morning it pegged so far that the feel off and got bent. My current theory is that the "cup" that is attached to the needle shrinks enough in the cold to interfere with the magnets that are spun by the speedo cable. This would explain the noise and the high readings. Any thoughts? or anybody experience similar. I don't have a heated garage so the truck sits outside.