We had a sending unit failure on our RV12, replaced it and changed the oil at the same time. Now we are only getting oil pressure into the yellow zone on the Dynon. Our mechanic is confidant everything is set up right, but doesn't have an idea why the pressure is reading low. Any ideas out there? The engine sounds perfectly smooth and we have run it up to proper oil temp to run it at 4000 RPM - but still no readings in the green.