Instrument clusters an be swapped between cars ... However .... The units when reprogrammed will always assume the highest mileage of any compnent installed cause different units store the mileage reading and cross refer then as a security check. Engine ecu, cluster ecu and lighting ecu all certainly do, and there is probably more. .
So if your car has done 50k miles and your replacement came from a car that's done 75k miles, then reprogramming will make the whole car jump its mileage reading upto 75k miles. ... Its a means by which to stop clocking the mileage reading.
What system is the mechanic using to read / clear the errors? The RR can store errors in multiple ecu's and where the original error might be cleared by the original ecu that threw it, the error can still be logged and displayed by other ecu's unless they are cleared too.
So you need all the errors of the car read and cleared sometimes. V8 or else ...
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