you are going to need to purchase a line out converter, such as this one http://www.crutchfield.com/p_142LOC8...0.html?tp=2001
, and then purchase an amp kit of some sorts. you will need to tap the line out converter into your harnesses existing speaker wires, some say use the front chanels, i've used the rear channels, i'm sure some one else can chime in with more detail for this. then you'll need to find a source for the amplifier's remot turn on. some use the ignition, some factory decks have a "remote" style output for perhaps a power intenna or something.