Tap into Mach 460 amp for sub signal

[LouisianaZJ]

where should i tap into the mach 460 wires to get a RCA level or line level input to run to a amp for a sub. the sub has an equalizer...

 

[urban96]

http://www.mustangworld.com/ourpics/fcar/despeeds1.htm

 

[LouisianaZJ]

cool thanks