the brain Is a seprate box that houses the 45x4 or whatever amp and all the rca connectors,
so instead of being single din they used to have a seprate massive box that usually unded up under the passenger seat that housed everything but the moniter. anyways just know that it was a pain… Its been awhile since i’ve looked a t indash monitors. if the new ones have that down to a single din thats awesome, and be thankful you never have to know the joys of instaling a brain.
injoy you tv and try your best to keep your eyes on the road, lol