This could be a fuse for the cluster but normally there would be other parts of it that would not be working either. However, since you said it started to fade and it is just dim and not completely blank, then that is the circuit board of the cluster itself.
The only other thing it could be is high resistance in the wiring from the fuse to the cluster but again, this would affect more than just the display.
So, if you want to check the resistance in the wiring then you can do that.
https://www.2carpros.com/articles/how-to-use-a-voltmeter
If it were me, I would start sourcing another cluster as I suspect that is what it is going to need.
See the wiring diagram below that will show the display is integral to the cluster.
Let me know what questions you have.
Thanks
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Friday, December 24th, 2021 AT 5:22 PM