A gauge cluster swap for any Focus with an SPI or Zetec is just a plug-and-play kind of thing. However, since you have a 2003 and it's possible that you have the PZEV engine, you will not be able to swap clusters unless you find a cluster with a tach from another car that had the PZEV engine. The Zetec and PZEV clusters are not interchangeable. The two cars use completely different computers.