Here's how to rewire the dashboard to upgrade the instrument cluster to work on a Toyota Camry.
The instrument cluster on older Toyota Camry models (2002-2004) are a plain, printed gauge face that have small writing, dim and generally difficult to read. The instrument cluster from the newer 2005-2006 model is a back-lit LED instrument cluster, that has larger font, intuitive gauge placement, is clearer, brighter and easier to read and lends a huge upgrade to the interior of a somewhat otherwise plain Camry.
This video demonstrates the elaborative re-wiring process that one must undertake to make a conversion harness (or repin the connectors) to get the new cluster to work properly.
References are made to the Toyota repair manual and wiring diagram, which can be found here for the 2002 and 2005 Toyota Camry:
Once the wiring diagrams are compared, a conversion harness can be made with some pigtail wires and female connectors from the junkyard. The wires are labelled, stripped and soldered to the corresponding pin on the female connector.
Furthermore, the rheostat is swapped in from the newer car to allow the panel to dim when the headlights are turned on.
Note: When swapping clusters, the engine type must be the same between cars in order to have a correct tachometer reading. As demonstrated in this video, a 4 cylinder cluster's tachometer will read too high in a V6 car.
Finally, the last step is to reprogram the odometer, which is stored in a 93c56 EEPROM chip behind the instrument cluster. It is desoldered and set on an EEPROM reader, where the HEX characters representing the odometer reading are altered to match that of the original mileage on the vehicle.
Please refer to this thread for more on Toyota odometer reprogramming:
Disclaimer: It is illegal to misrepresent the mileage on a vehicle at resale. Any cluster that is swapped must be programmed to correct mileage information.
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