I had to replace my pump motor this past weekend. The old motor was 1 HP with a 1.4 safety factor. The new motor, although from a different manufacturer, has the same specs, 1 HP with a 1.4 safety factor. My concern is that the old motor would show 15 PSI on the filter pressure gauge. The new motor only shows 9 PSI. I've confirmed with two different pressure gauges.
Is there something I'm missing? Am I concerned about something that doesn't really matter?