if the light is out then you need to get behind the dash and replace it.. sometimes you can take the radio out and reach your hand back there... on some models. i don't know about the 92 jetta. get on
www.alldatadiy.com and become a member and that will give you all you need to know and more...
the fuze may not say dash lights it may say something slightly different. like... accessory lighting, or might be included with other fuzes... check em all just in case.