The easiest way is to get the evox dash file from xbins and edit the .ini file to set your ip the same as the ip in x3cl and ftp the files over to whatever drive on your xbox and set the options in x3cl such as dash boot order and boot drive and your set.
By the way you can disable the boot to x3cl option to boot to your dash. and hold the white button down on startup to get back to x3cl.