Your car stereo may have an anti theft feature and so ensure that you have the control code to use when you are disconnecting the battery cables. Initially, remove the negative terminal connection, then, remove the positive terminal connection. After that pull off the screws in the instrument cluster bezel and then take out the instrument cluster screws. Remove the cluster and disconnect some electrical connections that are found at the back. This process is just the opposite of the removal process where the removal of the positive cable should last first and followed by the negative cable during the installation's process.