TM10-3930-660-20 CHAPTER 19 GAGES  (NON-ELECTRICAL)  MAINTENANCE 19-1. GENERAL This chapter provides maintenance procedures assigned to the organizational level for the gages (non-electrical). To find a specific maintenance procedure, see the maintenance task summary below. 19-2. GAGES  (NON-ELECTRICAL)  MAINTENANCE  TASK  SUMMARY — PAGE TASK PROCEDURES NO. PARA  . Hydraulic Oil Sight Gages - Replace 19-2 19-3 Air Cleaner Restriction Indicator - Replace 19-3 19-4 19-1