Hi , im getting low oil pressure on idle.. 15/18psi when fully warm. Im a bit worried and i don't know much was this problem going on as i installed the aem oil pressure gauge few months ago and was always like this since then. Changed the oil relief valve but still same readings. Should I replace the pump for safety or can i add some washers in the oil relief valve just to increase the pressure by few psi? Anyone did this procedure?