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To help directly, your car should idle with the oil pressure indicating about two lines on the gage, or more, when cool or warm. It may indicate about 1 line when warm/hot or older.
On page 3-4 of the manual, it says it needs to be at 0.7 (indicated) at idle (or more) and 3.5 indicated, or more, at 3000 rpm or higher.
My car is high mileage. It shows about 1 bars at idle, over 4 or 5 bars at high rpm, but drops to 3 bars or less when hot at >7000 rpm on the race track.
I assume yours is not showing 1 bar at idle? What weight oil did you put in? Re-check the level. Does the pressure go up when you rev it? How much?