[ericg2000]

i was had my radio out today so while in there i pulled my instrument cluster to see what kind of bulbs it had. all of them had these little blue covers on them (looked like mini rubbers lol). what are they for? are they for heat, or to dim the brightness? are they factory or something the PO might have done?

 

[Greenwood Wrangler]

Sounds like simple color changers. You can find them in gas stations and truck stops... And of course online. You can remove them to get the factory glow of the gauges.

 

[Blind Dog]

My TJ had those too. I figured it was OEM to whiten up the dash lights a bit by cancelling some of the reds and yellows. I replaced them all with green LEDs anyway.

 

[90DesertTanYJ]

My 90 had them as well so I would lean towards OEM.