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Why not use the speedo drive gear from an M40. Just today I sold an M41 and checked the drive gear against one from an M40. Both were the same part number and yellow in color. I know the M41 had been installed in an M40 car, so the previous owner had made the switch. Many Interstates now have mileage markers every tenth of a mile--and they are easier to see than the old signage. I do a speedo/odometer check on each "new" car I use when I'm out on the road. Take a reading between what your odometer says and the markers--drive 10 miles (actual) and compare the results.
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