Searching it seems that "Topside Control" is what spa folks call the thingy on top that shows the temp and where one makes adjustments and controls blowers etc. I didn't see any posts that address my issue.

My panel works fine. It's just fogged over so bad that you can't read the temp or see what each button does except in the dark. The thingy down below is a Hydroquip (think a 6000) VDS. The Spa is a Brand X. Goggling says I can buy just the Topside Control but I don't see much on compatibility with the thingy down below. What should I look for? Any source suggestions? Thanks in advance. Steve