I am setting up the
Oil adapter for 1/8" NPT and will buy a 1/8" NPT to AN-3 fitting from Earls. I will then run AN-3 braided line to the dash and hope to adapt to the Smiths gage.
The smiths gage has a fitting that looks like the end of a bolt with a center hole. The sealing surface is flat (like the end of a bolt). The line that comes with the gage has a nut and insert attached to the plastic hose. The insert (not sure what the real name is) is also flat and mates with the flat face on the gage. The nut just preloads everything.
Is this arrangement the "nut and ferrule" you were talking about? There is no tappered seat in the whole setup.