Just did the LED and white gauge face mod to my 88.5 TT cluster. The other two screws are on top of the dash. You will need a stubby Phillip's screwdriver to remove them. It's a snug fit pulling the cluster out. I dropped the column and pulled the steering wheel. It made it much easier
If you replace the lamps with LED's (highly recommended) I would not replace the Hi-beam indicator lamp. The LED is so bright when you are driving with your hi-beams on, the blue light will really glare in your eyes. I live out in the country and do a lot of driving with Hi-beams so it is a real pain in the butt having that blue light shining in your eyes. I have to replace my heater core, it just started leaking, so I will reinstall the standard lamp in the Hi-beam indicator. Just a heads up for you.
Good luck with your cluster.