Is it necessary to change up the wiring when replacing the fuel filter head or can you just plug and play so to speak?

The heater plug connector is different, and is supplied with the new head - you just have to cut'n'crimp the new connector pigtail to the KJ harness wire pair

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'05 CRD Limited
Pricol EGT, Boost
GDE Hot '11; EDGE Trail switched
SEGR; Provent; Magnaflow;
Suncoast T\C, Transgo Tow'n'Go switch;
Cummins LP module, Fleetguard filter, Filterminder
2.5" Daystar f, OME r; Ranchos; K80767's, Al's lifted uppers
Rubicons, 2.55 Goodyears
Four in a row really makes it go

Thanks