depending on the year mustang you have, it can be easily done if you have a 94-98. If you do have one of these years, you can swap the whole gauge cluster and then you will also need to rip your transmission and swap the speedo drive gear to an 8 tooth gear. If you have a 99+ I have no idea.
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60' ~ 2.1, 1/8 ~ 9.61 @ 73.4mph
Living one day at a time!
there is no advantage to having a higher mph speedo other than its harder to read
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