This weekend I swapped my speedometer in my 420sel for one from a 84 500sec. I know that the SEC had 14" wheels and now the speedometer and odometer wll be innacurate. Is there another way to correct this other than getting 14" wheels or new gears in the instrument cluster? I know some cars you can change the gear in the cable at hte transmission. Is this possible on my merc? Thanks.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual