1997 land rover range rover

I was hoping to replace the radio/tape player with a Sony CDX-GT710 receiver. Unfortunately Crutchfield cannot supply installation instructions for my vehicle. Endless searching has given me zero results. The system has plenty of potential with 6 speakers and a factory installed sub. This is the first European car stereo system I've worked with and I'm unfamiliar with the wiring. Any help would be greatly appreciated.

a dash kit is availible but needs a rewire to complete the install try a local shop for the install.Its true, its true!

Thanks for the reply. Is there any chance to get the dash kit online? I haven't found one yet. Trying to save some money because the rewire will be a little pricey. Thanks again for the help.