
the whole black trim has to come off. the climate control unit stays in place. i think you need to remove the trim around the radio first, not sure tho, its been a while since ive been around my car. the steering wheel dosnt need to come off but it makes it easier. theres about 5 screws on the top of the trim above the cluster, and about 4 or 6 at the bottom of the trim. all the buttons and switches need to be unplugged. once the trim is out theres about 4 screws that hold the cluster down. in the end theres alot of screws and plugs to be dissconnected. but could be done in about 1 hour if your good with this stuff. good luck however you do it.
if i remember right the color is apart of the lens and you may not be able to change that with just bulb condoms or bulbs.
oh not sure if you know this but the 90 M30 is cable driven speedo. the 91-92 is electric. just fyi incase you didnt know.