One of the features I miss on my Tesla 3 is the signal in the mirror when the is a vehicle in my passing lane. I realize there is a signal on the screen when there is a vehicle to close for me to change lanes. However, to see it I must take my eyes off the road and look at the screen. It's nice to be able to quickly look at the side mirror and immediately note whether it's save to changes lanes or not. Are there any aftermarket devices that do this?