I just wanted to know if it was possible to create/hack a heads up display (where it displays your vehicle's speed in the windshield) for a maxima? I know 3rd maxima's had this feature, but is it possible to hack one for a 4th gen?

 

Not sure if it's even possible...but here's something to consider: Most vehicles with those have a special patch of either something extra added or something built-in to their windshields in the spot that the HUD is projected onto for it to display better and be more daytime visible.

 

anything is possible with money. So in theory yes it is possible, but pratical no, not really.