What fitting do I need to attach my pressure gauge (female 1/8" NPT) to the port on the fuel rail?

I know the port is metric but I'm not sure of the size.


I have found that NPT is a US standard for pipes and fittings. There is a Wikipedia page showing different conversions of the NPT standard.

  • I'm looking specifically for information on the metric side - like diameter and thread pitch. I'm hoping to find an adapter fitting.
    – quisenbeje
    May 12 '15 at 15:05
  • Yes, I realised that after I commented and reread your question. I might find units and sizes for early 80s but not sure about specifically 1985 911.
    – coner
    May 12 '15 at 15:23

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