That's a thik nai truth β in the ward, I've seen the cheapest blood pressure cuff work fine if it's calibrated right, while the fancy one sits broken. Your father knew what oil pressure mattered, not the price tag.
Right you are β in nursing too, we see that the simplest medicine given at the right time works better than the costliest injection given a day late. My father-in-law always said, "Ol lagao, oil nahi" β the right pressure matters.