yes, they "click" in to the back... We were able to find the dash wattage was like 10.xx volts... so, naturally we needed enough bulbs to suck up the power. otherwise the bulb would burn itself out. I've used a soldering iron to replace the lights in Phone housingings when i was back in hawaii when that was the fad (very profitable)... my bro decided he was a pro and did the dash lights w/o me. so, he soldered the lights on himself. They worked for a little while but he decided he wanted to pull them off. Literally, pull them off... not knowing the hardened solder is pretty strong reguardless of how it looks, he pulled off the silver lining that the bulb touches in order to get power from the board.
and that's why his fuel and temp gauge on his instrument cluster does not light up any more.
if you can get my bro's dash to work again, he'd be very happy!!!
you must teach us the ways of the jedi... so we dont burn out any more gauge clusters =0) .