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make a transparent overlay for your speedometer face. Otherwise you can pull the transmission and replace the drive gear and the speedo drive gear too
 

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All my 105/115 have speedometers that read high. When I converted my Sprint from .456 to .410 the speedometer began giving accurate readings (according to my GPS).

I'd check your speedo with a GPS before concluding that it needs re-calibrating.
 

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^^ that's good advice. Typically one never knows (unless orig owner with good records) whether the trans has been replaced in the car, the diff replaced, etc.
 

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Find one of those radar-based speed limit signs which shows your current speed.

There's one less than a mile from my house and it shows my S2 speedo reading high by 5 MPH after transmission rebuild. (As a reference point my Crossfire's speedo is spot on.)
 
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