Jon: You have an "N"?  I follow the TCM SB for the fuel setup with 2 hoses and 2 gauges that were included by the previous owner.   You need to adjust low unmetered, metered and max takeoff flows and changing one setting can change the others.  On my engine there is a tee fitting on the low unmetered and metered side.  Caps on each tee can be removed for the checks.   I just confirmed the low unmetered this week at 8 psi at 600 rpm as part of my checks. Do you need the SB or do you have that already?