Nessesary accessory if you want to install a gauge of any kind.
You can find some which they are made for your car and they fit exactly, or you have to try few so you can find which one it fits where.
There are made to hold, one two or three gauges and they can fit on the top of your Dash or by the window frame.
You can find them usualy in black or carbon look color. Make sure if you want to install them at your windshield frame, there are not any air bags on them!!!