Well, that image is NOT a 98EV. In 98, the instruments had white faces.
For the tach, two allen head screws and the chrome outer cover comes off. You then have direct access to the backlight bulb.
For the speedo, in addition to the two screws, you will need to undo the drive cable (careful not to lose the aluminum washer) and you will need to unscrew the reset knob. Then you can pull off the chrome outer cover and you have access to the backlight bulbs. The instruments can stay resting within the rubber grommets of the dash panel.