question relating to the tooth count for the speedo gear. The has been fitted with the turbo 700 auto with a 3.36 diff ratio and 205/70 14" wheels and tyres. Anyone know how to calculate the correct number of teeth the speedo gear need to get the speedo to read accurate?

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Anyone know how to calculate the correct # of teeth the speedo gear needs to have? The van has been fitted with a Turbo 700 out of a VN Commodore. The van is fitted with a 3.36 diff and 205/70 R 14" wheels and tyres.