[Dark_5.0]

Your stereo has 2 positive wires, use a test light to find the ignition wire. When you turn the key forward the light should come on and when you turn the key off the light should go off.

Once you have found this wire that is were you splice in your amp remote wire. Ground the amp as close to the amp as possible.

Radio shack makes a preout adapter that splices into your speaker wires. I dont think the mach 460 has pre-outs.