I have been searching for answers on aftermarket headunit installs for the GS and was wondering if I can install an Eclispe LCD headunit in place of the Nackamichi headunit in my GS400. Can I plug the line out from my headunit into the line level inputs of the Nakamichi amps? What kind of adapter will I need to connect the Eclipse headunit to the factory harness? Any help will be appreciated. Thanks