If you really want to save some $$$$ go to ebay.com & buy the wiring harness adaptor # 70-7712 by metra,remove the dash panel,which is very easy to do,remove the cassette player,plug the adaptor to the OEM harness & begin the installation by ID ing each wire from the adaptor to the new head unit's harness,plug the new head unit & you're ready to go.

You might need to remove the metal sleeve along with the cassette unit & place in the new sleeve there with the new head unit,but try first if the new head unit will fit in.

If you need more info to have the job well done just go to the metra's web site & look up for the isuzu vehicross's electrical A/V diagram if you get confused

The adaptor is cheap,i got mines for just $ 7.00 + shipping (1.56) and it did a excelent job