Technical T5 transmission speedometer gear

I recently built a new rearend for my coupe and changed the gear ratio from 2.73 in the old one to 3.89 in this new one. I've been having a little difficulty in figuring out which plastic speedometer cable gear I need to buy to get the speedo right...any suggestions? The tyranny is a T5.

Thanks!

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https://lmr.com/products/Mustang-Speedometer-Gear-Calculator

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http://performanceparts.ford.com/download/charts/142.pdf

 

Thanks!!

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