getting this odd glitch on BOTH 27kw Onan MKDBTs (2009 with 1500 and 2200 hours) After running for longer time periods, at least 24 hours, oil pressure readings gradually goes down to the point where it will pre alarm on the Onan panel as well as the alarm on the boat Isis monitoring. Eventually, a few hours later generator will shut down with oil pressure fault. I don't see any oil pressure switch in the parts book or wiring diagram, it seems that Onan uses the sender output to trigger a shut down. Oil level good, changed the oil and filters on both units over the past few weeks but still happens. If anything the drop seems to happen more rapidly now, after 12 to 18 hours. Both gensets show the same symptoms. I have already ordered two sensors so I can replace them when we get back home on Thursday but I find it odd that would take so long for pressure reading to come down. anybody seen that failure mode?