PART NO.  SPL.PAGE  DESCRIPTION                                                           
83875     15.O.3    Connector for oil gauge pipes (at starter switch bracket)
83875     16.O.1    Connector -oil gauge pipe -(at starter switch bracket, instruments,
    1600 and 1600-MK-II) -was 83875
83875     TC.O.2    Connector -oil gauge pipe -(at starter switch bracket, instruments,
    Twin Cam)

83875 Connector for oil gauge pipes (at starter switch bracket) -changed to AHH5820

Alternate numbers:
Moss part number 435-530

Mating thread for these parts is 1/8-BSP (28 threads per inch) The replacement hose from Moss Motors and Limora was reported to be faulty in October/November 2021, having incorrect thread that would not connect to the male threads on the mating fittings.