Hereís how to reprogram your digital odometer to read whatever mileage you want. It great for cluster swaps, as in my case I swapped a Lexus ES300 cluster into my Toyota Solara.
Many cars store digital odometer values on the instrument cluster itself. Itís stored on a little chip on the speedometer circuit board; itís called an EEPROM chip, usually of the 93C46, 93C56 or 93C66 variety.
Once you get access to the chip by opening the cluster, it can be de-soldered and either swapped or reprogrammed.
I have gone through extensive testing and decoded the chip to present the following procedure. Iíve worked with Toyota Camry, Solara and Lexus ES300 clusters which are all interchangeable, but the procedure should be the same for many, many cars that use a similar chip setup, with only the programming differing.
Itís perfectly okay to change your odometer reading by yourself. However, it is illegal to roll back or misrepresent the mileage without disclosing to a potential purchaser of your vehicle that the odometer has been tampered with. Keep clean!