86 cutlass ciera 2.5

hi my gf owns a 86 cutlass ciera with the 2.5l 4 cylinder engine in it. About a week or two ago, the gas gage stop working, then the cruise control, then the rear defroster switch wont stay on, it turns on and works but you have to hold the button down, then when you turn the lights on the beeping that happens when you leave your lights on after turning the car always happens even when the car is in drive. i know some stuff about cars but not everything, i checked the fuse, all were good, any help is appreciated, thanks kenny86_2004

hi my gf owns a 86 cutlass ciera with the 2.5l 4 cylinder engine in it. About a week or two ago, the gas gage stop working, then the cruise control, then the rear defroster switch wont stay on, it turns on and works but you have to hold the button down, then when you turn the lights on the beeping that happens when you leave your lights on after turning the car always happens even when the car is in drive. i know some stuff about cars but not everything, i checked the fuse, all were good, any help is appreciated, thanks kenny86_2004

The relay that controls the rear defroster is probably NG. It supposed to shut it off after several minutes, yours sounds like it not working.I think its located in the glovebox.
The key beeper could be caused by one of the door jamb switches being faulty. The cruise control on that year works off engine vaccum, look for a bad hose.