My oil gauge needle is normally at 38-40 when at normal idol( tach gauge picture is at normal idol) and goes up to 80ish at full rev, but today when I started her the needle only went to like 20-22 ( picture of oil gauge) I thought it might need to just warm up so I've been driving around all day and the gauge still reads 20-22 at idol and when I revved it all the way the needle only went to right above the 3/4 mark on the oil gauge. I checked the dipstick and the oil is still gold and is not low. Could the gauge be broken? or oil pressure problem? Or something more serious?