I have to say, this is really what I miss on the new FX45 I just got. I've sold my 98 Grand Prix GTX. It had every option including the Head Up Display. The display shines against a mirror which projects this up to the windshield.
GM was a pioneer here putting it on the Bonneville and the Grand Prix back in the early nineties. It's also available on the Park Avenue, Corvette, and Rendevous.
The display shows speed, radio stations, turn signals, high beam, other idiot lights. Corvette also shows tach and is customizable.
It would be an electrical nightmare to retrofit one from another car into another not meant for it, not to mention that the mechanicals wouldn't even be close. The GM ones have a motor in them for adjustment angle.