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The milage and car specific information are stored in a chip in the back of the instument cluster called the codeplug. On early clusters, the ones from before 2/89, it's a blackbox in a brownplug that plugs into the instrument cluster. Later types have the chip intergrated in the backplate of the instrumentcluster.
There are 3 chips used as codeplug in the E32/E34. In order of production these are: HML075, PIC 93C46, PIC 93C56. The HML075 chip is the affected one. I couldn't find anything about the manufacterer of this chip or a programer to read/write from/to the chip. The last two are standard serial EPROMS and can be reprogrammed by anyone with an EPROM programer.
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