So im having an issue with my oil pressure on a cold start. In the morning when I start my car (engine has been off overnight and is cold) the oil pressure gauge goes to its normal position for about two seconds and then goes to no pressure. I immediately turn off the engine and start it again. Same thing happens. It seems that I have to start it 4 or 5 times until it gets some warmth and then the oil pressure is fine. I haven't had a problem when its warm, only when it is dead cold. Could it be the sending unit? Any thoughts are appreciated!