Well, my speed cal doesn't have the little red LED light lighting up when driving. It has power, and the fuse for the Cig lighter isn't bad. I just replaced the Speedo gear, because my speedo was notchy and not smooth. Well now the speedometer doesn't work. I noticed while going down my street, I pulled it back up the street, and took another car. Since it has snowed, I have not driven it. Do you think that its possible that the Speedo Gear isn't completely in the tranny? Any other thoughts?