I dont like brainiac tab mount because you can not take out the tab. In my case slide up , push the upper part inside and its out. If you go with 12" then measure it from all sites. I think its too big. You will lose the shapes of oem plastic. My first idea was to run gauges on the tab. My car is a fully build tt so i needed to see things like oil temp...now I have the haltech ecu. A friend of mine has made custom gauges that will replace the oem. Its connected to haltech via hub and every display has many mods. Ill post some pics.