I had the same problem with a Hyundai Accent 1996. You need to
disconnect the speedometer inside the front hood.
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Yes you can, you and export both the data in excel sheet and
compare the numbers.
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Yes you can do it
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A 1997 and a 1994 Hyundai Excel's dashboards are not compatible.
Due to design and differences in shape, they are similar but cannot
be directly swapped.