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Thank you all who contributed but it seems there is no definitive info on this so Im thinking of turning the cable manually while counting the turns until 1 tenth of a mile registers and then multiplying those turns x 10 to give turns per mile . Will keep you all posted .

Chris

You could put the end of the speedo cable in a cordless drill set to a low gear, drills usually have their RPM's listed on the side.

1/10 mile isn't likely to give an accurate indication. Use an electric drill to run up ten miles, then do the math. Running the speedo at an indicated 50 MPH may give the best accuracy. I used to be able to get assorted speedometer drive gears at a local Ford dealer for adjusting accuracy. Some of the gears may be the same across different manufacturers and applications.