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2-3 years ago, I had 4.10 gears installed and they adjusted the speedo I am guessing using the SCT II scanner I purchased. A while after that, I had a custom tune installed and its been like that for years. Last week, I decided to reload my stock tune so I can start using 87 octane again. That went fine but it must have wiped the gear ratio setting because my speedo doesn't work right now. I noticed this morning when it said I was doing 90. As much as I wish I was, I know I wasn't and the gear ratio must have been reset to stock. Question is how do I set it back to 4.10 using the SCT scanner? Can I do it just with the scanner or do I need a laptop too? Now when I get pulled over, and the cop says, "do you know how fast you were going?", I have to honestly say, I really don't know.:shigrin