Not sure where you would find an after market HUD at a decent price other than the junkyard but you will need the windshield made for the HUD feature. I replaced the winshield on my 1998 GP with HUD and didn't use the HUD designated winshield. The HUD never looked the same again. I gave the car to my daughter who didn't care about HUD and I bought the 04 GT2 with HUD. Sorry I don't know where the wiring harness for it is located.