# 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:** 11

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**Author:** ![imported\_Sleeper](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/imported_sleeper/32/5939_2.png) [@imported\_Sleeper](https://forums.speedlife.net/u/imported_Sleeper)\
**Post date:** [February 27, 2007, 12:37pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/11 "2007-02-27T12:37:17Z")

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> [@another full custom trunk job 76 lesabre........](https://forums.speedlife.net/t/another-full-custom-trunk-job-76-lesabre/28387/7):
>
> 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

Ahh i see, i thought it was as simple as a tune or software rewrite programm

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