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Old 06-07-2008, 04:17 PM   #1 (permalink)
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incorrect speedo reading.

Hi Guys,
just noticed the the reading on my speedo is incorrect. I've recently the I get three different speed reading from my speedo, on board computer and my navman satnav. Any help would be greatly appreciated.
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Old 06-07-2008, 05:41 PM   #2 (permalink)
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what year... what model... what type tires u got? change of tires away from specs will alter your speedo
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Old 06-07-2008, 11:22 PM   #3 (permalink)
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That is actually very common. The navigation is going to be the correct one, because it gets its reading from a satellite. You can have the OBC and the speedometer corrected by a professional; however it may come to be a headache and not worth it.

Since you have a navigation, you are much better off. Just follow that. The problem is know to be an issue right out of the factory; and when different sized wheels are added it only complicated the problem. The nav will always be correct due to the nature of how it measures it.
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