If you're running conventionally, the instructions in the engine's user manual should be sufficient.
If running under DCS, a very complete explanation may be found in The DCS Gauge Companion 2nd Edition on pages 1403-107.
If you don't have a copy of the book, click on the link below to access MTH's notes on the subject:
http://www.protosound2.com/dcs...ionStopOperation.pdf
This and a whole lot more is all in "The DCS O Gauge Companion 2nd Edition", now available for purchase as an eBook or a printed book from MTH's web store site! Click on the link below to go to MTH's web page for the book!