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· Premium Member
1,786 Posts

Newer cars and truck no longer have a cable, (Good & Bad). They are electric.

Someplace on one of my other forum they had a site that will actually help you to calculate what gear you need to change to make the speedo right.

I will have to look around to find it, unless of course some one here knows it.

I forget the math, but when you change tires there is a formula to tell you how far off the speedo will be.
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