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Well... Looks like I hit a snag. From what I can see, the mechanical speedo has a gear in it (prior to the speedo cable) that has an unknown ratio to the output shaft. I have done my best to figure out what that ratio is, but it's all hear-say until someone can actually find out what it is.
I calculated the Output Shaft as 3349.777962 Rev/Mile. This means that in order to get the pulses/mile close enough to given pulses/mile (which was emailed to me by the manufacturer) the speedo gear ratio must be in the neighborhood of 3.35:1.
With that information (which may or may not be right), the resultant PPM is found to be 15998.94 such that one could be fine with 15999 or even 16000 without much issue.
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