it seems you have a import speedo with the 120mph facia fitted onto the 180kph clocks.
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now question is are you changing the whole unit or just the clock facia.
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if its a rev 1 then its cable driven speedo, so you might struggle fitting the 180mph clock.
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but if its a rev2 upwards and the speedo is electronic then you might find a small speedo converter chip fitted behind the clocks, in this case
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, fit your 180mph clock and remove the chip.
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if its just the speedo facia then it will read wrong if you just replace the 120mph facia with the 180 mph item,.
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hope that makes sense