motor: s13 sr20det
so i have this crazy problem when i first start my car and the battery voltage is at 12v the motor idles good and my oil pressure gauge works perfect (aftermarket) but as soon as i rev it up and the alternator kicks in at 14.7 v the motor idles like crap and the gauge stops working if i unplug the alternator plug the idle jumps up to normal and the gauge works again.. anyone have any idea whats going one thanks in advance
