gauges panel bulb

You guys know that little stock yellow bulb that lights the gauge panel at night??? What size are those bulbs and how do u pull it out?? It doesnt wanna come off.

Its the little bulb behind the instrument panel (gauge cluster). Its also the same wire/bulb i spliced into for my indiglo gauges. but its hanging behind the steering wheel with all the other wires so it lights up below the driver's side. bad thing is its yellow so I want to kno if I can change it to blue with a sleeve or a new bulb?? so It can light up blue at nite instead of yellow....