Jeep Wrangler YJ LED Dash lights is a very nice upgrade from the cheap stock incandescent bulbs. You get much more light which not only looks cool, it provides more safety due to being able to see the speedometer better. Also better visibility to monitor whats going on with your engine.
Shown in the video below is the procedure to access and change the bulbs. All you will need is a Phillip screwdriver and a pair of needle nosed pliers. The pliers are to make accessing the bulbs in the speedometer a bit easier to change without completely removing it.
Do yourself a favor, after you install the bulbs in each gauge / cluster, turn on the dash lights to ensure they come on. LED bulbs have polarity, meaning they only work one way. If one happens not to come on after installing. Simply pull the bulb back out and turn it 180 degrees and plug it back in. This will put the contacts in the proper posts to allow things to work as they should.
For my 1991 Jeep Wrangler YJ it took a quantity of 10 for the gauges - Bulb #194 LEDs. If you want to change the bulbs for the heater control, order 2 packs. You will have some left over. But .. thats fine. You can find other ways to use the extras.