I see some 1937 knuckleheads that the oil gauge line screws in the pump and others have fitting that the line screws into and those pumps are faced off and have a copper washer for the fitting . Also i have seen restored bikes with copper and Nickel plating Oil lin 1.png oil line 2.png Oil lin 1.png Oli guage line pump Carl Olsen 1937 Brown.png ng
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1937 Oil Gauge line Knucklhead
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Your pictures don't enlarge and are too small to make out detail. Here is have the left the factory. The spot faced pump with washer appeared in 1939 for the electric oil pressure gauge sender..You do not have permission to view this gallery.
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