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T10, just about any will work. and the LEDs are bright enough to shine through the green plastic, (assuming you have moonies) so you can go to just about any color. i've got one red truck with red gauges, and a blue truck with blue gauges. you can get ten on ebay for about 10 bucks.
You might want to find someone who has done this to see the end result in person. I think it's my least favorite mod I've done so far. Too bright to be comfortable while driving at night for me. You can actually see me from outside my truck. Like someone inside my dash shining a flashlight in my face.
I've just been too lazy to change them back to the original bulbs.
MOST of the LED bulbs won't dim. There are dim-able LED's but are expensive. I was hot to trot on led dash bulbs but gave up after the expense of the dim-able LED's