Hi there. Question regarding POH and D180. POH has you power on D180 first using back up battery. After start look for oil pressure to 12psi within 10 seconds. Then turn on avionics master. I have found no oil pressure on back up battery, but as soon as I turn on the avionics master switch, presto Oil pressure. Previous thread notes sending unit is not powered until the avionics master switch is on. Is this a typo or POH mistake? Any thoughts appreciated. Cheers and fly safe. Long time listener first time poster.
Michael.
Michael.