C4 speedometer gear

Cougar Community Classic Cougar Maintenance Restoration and Repair
1

Whats the easiest way to determine how many teeth speedo gear I meed? Ttans id 24 splined shaft c4. Late 60s. Bought it without speedo gear.

Thanks

2

Well you would need to know the tire diameter and the rear axle ratio. Then look here: Speedometer gears

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3

Thanks Royce