You will need a mounting kit to get a perfect fit & it will appear factory. No mods are necessaary, I just did one and it looks perfect.
I cannot remember the VSS wire info, but it can be found on [url=http://www.the12volt.com]www.the12volt.com[/url]. Nothing unusual because it is a diesel.
The reverse wire is easy too, just go back to the backup lights and splice into the wire that goes to 12 volts when put in reverse.
Good luck.
Jeff