First of all this is the X3LCD kit. You get the custom manufactured LCD
screen and the i/o cable to connect the X3LCD to the X3 Modchip.
 

The X3 Modchip has hardware controlled contrast adjuster. Also note where
the LCD I/O Cable plugs into the mod.

This is where the LCD I/O Cable plugs into the X3.
 

This is where the LCD I/O Cable plugs into the X3LCD.

You now need to enable the X3LCD in X3 Config Live. This is what your first
screen should look like - select "Settings"

Select "LCD Settings"

The LCD screen is turned off by default. Press "A" to enable it.

Now the LCD is enabled. The LCD brightness level is set to 100% by default
as this looks the best. However you can adjust it if you wish to.

You can even customize the startup text to say anything you like.

You are allowed 19 characters. Use your imagination ;)

If everything has gone to plan then this is how your LCD screen should look.

This should give you an idea of how Xecuter customers are fitting the LCD
screens. They all seem to be using Dremmels to cut out the hole. Make sure
you protect the back of the X3LCD against any shorts when fitting to the
Xbox. Physical damage from shorts will not be subject to a warranty.