How do you rectiry Speedometer Errors

[BAZPRADO Senior Member Find all posts View Profile Close BAZPRADO]

On my 97 SWB 3.4 L, I use the OEM tires, Dunlop Grandtrek 265-70-16. I had my new GPS unit with me during my last tip and it showd an error of about 8KM !!!! The Speedo shows 120 KPH while the the actual is about 112/113 KPH, how is this possible? Can I recalibrate the Speedo or this is something I have to live with? I have never heard of such a huge error using OEM tires.

Thanks.

[FlyNdrive Advanced Member Find all posts View Profile Close FlyNdrive]

Mates,

Us Yanks got everything covered. Check out the "Yellow Box" http://www.blackrobotics.com/yb_home.htm It is an electric speedometer calibration box. It splices to one wire under the dash board and has a series of switches that when in the combination (from the instructions) are in the right code will make the odometer show correct.



Good luck,

-Ben (Your American cousin)

PS. Shipping is somewhat slow. If shipping to UAE (or OZ for you others) is unavailable please let me know and I can have it shipped to my place and DHL it to you. -BM

[BAZPRADO Senior Member Find all posts View Profile Close BAZPRADO]

Sounds like a good idea, would this work with older systems like my 97 SWB, I am assuming these are all analog, but surely they have a speed sensor non-the-less.

Thanks.