Good day,

The oil light comes on and off on the dashboard. The oil level is good and the gauge shows low pressure, but I haven't had any issues. How can I make it more stable while in low RPM?
While running the light goes off and comes on while in slow throttle.

The '04~'05 VQ40's are infamous for bad gaskets behind the timing cover allowing oil pressure to bleed away at idle speeds. The later VQ's including some 3.5's can have the same issue, but the '04~'05's are particularly prone to it. If a mechanical gauge confirms your idle oil pressure is below spec (about 13 psi as I recall), the timing cover needs to come off.