DO NOT even chance over heating it... i would get an iron with a bigger tip and see if that helps (it should) and if it doesn't then you need to get a more powerful iron...
the reason i say do not chance over heating ur speedo is cuz since everything is such sensitive electronics now you could fry the smallest component and not even realize it until it is too late and your car goes out of control (as mine has :P)
-Jim
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