Gauges.....im confused? Options

[KB-2]

okay so jsut a few simple questions that someone can answer for me...gauges....speedometer gauges...


http://www.andysautosport.com/toyota/1994_...fa00124795.html

lets jsut use that as a example.......

now im familiar with taking the speedometer out and switching up the bulbs and what not...

as for instilation of that thing....do i jsut need to open everything up and take off the old numbers/faces and put the new ones on?

and that will automatically make it light up that blue and waht not????

or is there more to it than meets the eye? do i need special bulbs with that? or do they provide them???

just pretty much a explination of all this would be great!

thanks