The relay is just a pass-through for high current by allowing control with low current. Not sure if changing the relay will stop ricer flash but if it works, I'd love to see a write-up on it!
Changing the cluster is a bit of a pain, and you'll want body panel tools for this or you'll put an impression on the soft dashboard surface if you try it with a screwdriver wrapped in electrical tape (I was able to massage the impression out but it took time).
The panel to the right of the instrument cluster has to be removed (it's the one that contains the clock and the center vents). Work your way around slowly with the panel tool to pop off the clips.
The panel to the left of the instrument cluster (opposite of right side) needs to be removed as well.
Then, you'll lower the steering wheel as far as you can, and use the panel tool to pop off the instrument cluster bezel (start from the top and work to the bottom evenly between the sides to prevent damaging the lower bezel trim pieces).
Once that is out, you'll see the 4 bolts holding the cluster in (8mm or 10mm ... can't remember), and you'll have two connectors to remove.