The chip can be read and written to using a serial programmer. Odometer information is stored on a small EEPROM chip on the circuit board. Therefore the mileage of the original vehicle that the cluster was from will be displayed on the dash. The mileage on most (Japanese) cars is stored on the instrument cluster itself, and not in the ECU. Let’s say you swapped an instrument cluster from a coupe to a sedan to change the look or color of the needles, or you’re replacing a defective cluster.
