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My thoughts.. Call 911, first, on speaker, drive defensively putting distance/objects between you and the BG. This could be as easy a slowing down vs. speeding up. Passenger gets description of vehicle/driver/license-plate, possibly with cell-phone pics. All while you try to put distance/objects between you and the BG. Get someplace public that likely has cameras if it comes to that... Gas station, bank, etc.

I wouldn't display my weapon, especially in a moving vehicle. Too much could go wrong in so many different ways. If I see a gun then yeah I might be slamming on the brakes, drawing and yelling into the phone "he's gotta gun! get down! etc."
Otherwise I'd focus on paying attention to driving and defense. And for all you know the BG turned off on a side-street after seeing a gun and called the police to report some lunatic in a small 4-door sedan waving a gun at him...

Of course it's easy to say here from my arm-chair, since I don't have some crazy trying to side-swipe said arm-chair. Hopefully if I'm ever in that situation, I'll stick to a defensive plan that avoids gun-play and bumper cars.