Turn the ignition to ON and you can see some of the bulbs when they light up (obviously). Shine a flashlight on the cluster and you will be able to see all the bulbs around the perimeter. After that, all that is left are the bulbs towards the center (speedometer, rpms, etc.). I think there are three of those.
This is from my 2002 4WD and is very similar to the 1999 4WD. May or may not be helpful for your 2WD.