Why does Crutchfield say I need this to install a Pioneer avic z3 nav unit is it for the amp or something different ?
http://www.crutchfield.com/p_127C2RFRD1/PAC-Ford-Radio-Replacement-Interface.html?tp=3486&tab=review
http://www.crutchfield.com/p_127C2RFRD1/PAC-Ford-Radio-Replacement-Interface.html?tp=3486&tab=review