Spilled coffee, dash speedometer doesn’t work

So I placed my cup of coffee on my dash for a quick second and accident hit the breaks a bit harder than I expected and spilled coffe all over my dash and down into where the dash display comes out of. I wiped it immediately but it was a good quarter cup that spilled and some just of dropped through.
I quickly realized that the displace was missing pixels and just acting up within minutes, and ten minutes in the whole displace is now blackout.

please help me as I have basically sold the car already and don’t want to give away a broken car