Normal (baseline) FCOM Procedure is to use dual AP for ILS/GLS
Reference the Cat I AP use comment... Not so. The normal (baseline) B737NG FCOM Procedure is to use dual AP for ILS/GLS regardless of reported WX. See typical FCOM page that (as of 2011 and before) stated:
-Arm Approach Mode
-Engage the other AP
See NP.21.68 "Landing Procedure - ILS or GLS"