OK you win (ish!)
Healthy debate and enjoyable too! These exchanges of opinion exercise the grey cells and do extend knowledge and understanding! Just to make clear though.... when "my" Bonanza dumped oil over the windshield, the donk didn't quit... the guage still showed 30 psi when I landed 15 minutes later (after an ILS approach to minimums and landing looking through the side window.) Secondly.... and I do believe this passionately: any PPL instructor can (and should!) learn about those instruments and be able to describe their operation clearly to students. Dear God.. there cant be more than 3 or 4 hours learning to cover them all! Kind regards to all bm