It's a bit of work, but it can be done. Then again, depending on the year of the car it might be more cost effective to replace the head unit with a matched harness for the Mach system.
It's actually not that hard to tap in signal, just find the wires coming out of the amps in your trunk. The ones going to your rear mids and tap the converter in!!!
It's actually not that hard to tap in signal, just find the wires coming out of the amps in your trunk. The ones going to your rear mids and tap the converter in!!!