First, where does the voltage gauge start out at before you hear the noise? As far as the oil pressure gauge, chances are the oil sending unit is bad.
If the volt gauge is low and goes up when you hear the squeal, the belt is loose and finally catching up with the alternator. Also, make sure that it isn't covered in oil, coolant. THe oil sending unit is a cheap and easy part to replace.
Check that and let me know what you find.
Tuesday, December 21st, 2010 AT 2:21 AM