Jon Peltier has detailed instructions here:
http://peltiertech.com/Excel/Charts/SpeedometerXP.html
Just be aware that you're in for a great learning experience!
However, if you're not in the mood for a learning experience.....
I followed Jon's instructions and created an easily adaptable SpeedOmeter
chart that I can make available to you.
Is that something you can work with?
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Regards,
Ron
XL2002, WinXP