95 nissan maxima bose question

use an amp interface module and a normal nissan harness and you'll be set.  A better option is to bypass the bose amplifiers, simply by taking the signal wires that go to the speakers (normally purple and yellow in the front doors) cut and connect them directly to the speakers, do the same for the rear speakers and then connect the deck without an integrator directly to your factory harness using the nissan adapter.  Maybe this sounds complicated, but it's really easy and most of the older nissans with bose need to have this done because the factory amp are failing anyway.