The HUD for my milage oil level n etc stopped working

Your AC just needs a can of R134a. Is that red wire making any contact to any metal? I believe that's your wire to your radio that engages when you turn the key on. If it's touching a ground, that might explain your gauges and lights.

N that's the recharge for the ac? No it wasn't making any contact,couldn't really tell to be honest,it was jz slowly coming more & more down. When I got to the fuse box area it was just there I tried following it,to trace, n it just went towards the ac nobs & etc. My stereo works fine,turns on & off like supposed to when doors open & etc. Light all work as well,they just don't turn on & off like they used to.

Only thing I know to do is check your relays and wiring. And also your wiring to your ignition because I know if that's loose, your cluster panel and auto headlights is picking it up as the key is turned off.

OK,another thing sorry,I'm no mechanic or anything & everything I've been googling isn't helping I'm getting everything but... Would you know where that is? & that wire isn't connected to anything so idk where to go from there

Been trying to get the owners Manuel for it & I only get up the the alarms & seat belts im looking for wiring connections n etc...

https://www.youtube.com/watch?v=d3cPtnXTiAA It's not a pontiac grand prix but I hope this helps.