All it takes is pressing one button to get your pop-ups up! Include it in your waypoint change checks if you like, and half way along. You will still get plenty of warning, or if it is a rapid loss of oil, it won't make much difference anyway. I've been flying these instruments for 10 years and never had a problem with it. In a way, it's better than having the instruments there displaying all the time. At least your attention is drawn to a fault.