Hi All, I was looking for definitive info and couldn't find it easily, so I researched it and made a call to Mooney International Technical Support. The JPI EDM 900 has its tach adjustment factory default to be 2400 rpm.  But I wasn't sure what Mooney set our average cruise engine speed to be on our tachs for our tach time. I called Mooney International Technical Support regarding my M20J.  They looked up my original mechanical tach and told me it was setup for tach time to equal