I have been able to change the arrow to my G35. You need to use Reshacker and use this DIY at GPSPassion
CAR: 2007 G35 Sport Coupe 5AT
HARDWARE: Dell D630 w/ dock, internal 80G HD, internal 320G HD, Verizon Wireless Card, iBlue GM-2 GPS w/iGuidance, OBDPros w/DashCommand, Visteon HD Radio w/ Home Made Cable, Current Version of RR w/ DFX Skin. My Install.