I've been reading and looking but can't find my exact situation. I'm throwing the P0521 amongst others I think I found answers to. Anyway so my gauge shows its holding right around 40 whenever its on, I've never noticed a bad idle or the gauge bouncing around. I've seen people are replacing the filter and screen below the oil pressure sending unit and unit itself but seems to be more for people that aren't holding pressure. Is that my issue? Any tips? Is the sending unit just a sensor in the motor because that's all I'm seeing? Thank you in advance