Hi, I know this topic is old but just to share my experience; bought a used speedo form ebay, but after swapping it with my standard one with no rev counter i've found that the mileage of the car that the new unit is from is displaying and STOP light is flashing and also temp warning light is on. So I guess it needs to paired to my car with a software. For now I have fitted original unit in place and will ask about in different garages is they can do the codding/pairing. the good news is the rev counter it self was working as it should.
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