Speedo Gear

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On average, you will need a 23 tooth speedo gear., That is the gear that works MOST of the time, your results may vary. You can also go to a speedometer drive service shop and they can install a reduction or step up unit in the speedometer cable and get it dead to nuts right.
You will likely have to change out the transmission speedo drive gear. I have a c4 in my '68 with 3.73 gears and I will have to install a 6 or 7 tooth gear on the transmission. I think the highest tooth speedo gear you can get is 23 and that's not even close...