Do not assume the "factory" needle settings are worth any more than what it will take to start the engine. It must then be tuned - to your prop, altitude, air temperature, etc. There is no way on earth the needles could be preset taking all or much of any of that into account.
Rather than write out the tuning process again, here's a link to the tuning and some other notes I wrote out a while back. There's also a wealth of other info in that same string you might have a look through once as well.
http://www.rcuniverse.com/forum/gas-...l#post11210626