speedo gear for 3.73s

cinstral

SCCoA Member
i am going to have a shop install a set of 3.73s in my '90 Automatic Cougar XR7. my question is: if the computer reads mph to know when to shift, will not installing the speedo gear screw with the shift points? if i do need to install one, how much do they cost, and how do i know which one to get?

thanks for any info.
 
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