This is how I finally formatted my date reference to get rid of the too few parameters expected error in case anyone needs it :).
mainsql = "SELECT tble_TempLOSDate.PtAcctNbr, tble_TempLOSDate.AdmitDateTime, tble_TempLOSDate.LOS, tble_TempLOSDate.DispID, tble_TempLOSDate.FacilityID " & _...