# New gears = Messed up Speedometer

**URL:** <https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290>\
**Category:** PittSpeed Automotive\
**Created:** [February 27, 2007, 11:58am UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290 "2007-02-27T11:58:28Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![BlueZ06](https://avatars.discourse-cdn.com/v4/letter/b/5f9b8f/32.png) [@BlueZ06](https://forums.speedlife.net/u/BlueZ06)\
**Post date:** [February 27, 2007, 12:36pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/10 "2007-02-27T12:36:20Z")

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> [@Whos ever gotten poison oak????](https://forums.speedlife.net/t/whos-ever-gotten-poison-oak/28363/16):
>
> Written as in software right?

once you save a change to the pcm/ecu with one of those things, it VIN locks itself to that vehicle. Until you unwrite what you did… i.e. restore the defaults

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