Where and how do I start getting a temp monitor screen inside case

Idk where else to post because like rbgs, some folks cant stand it. But i finally got a high end build and wanna get some of the fun extras that my previous low end build had 0 reason to have. One of which is i want a temp screen inside the case. Not looking to replace aio so it'd be a separate unit but my big key is the info and display needs to be customizable because, well, I mean the sub is about matching rbg profiles....

But where do i start. Is Aida the only option? I just want a dope little screen in there i can customize and never look at again