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Does anyone know the size of the service bolt at the fuel filter?

22 November 2001
The banjo bolt on the fuel filter has a service bolt in it which can be removed to install the Honda fuel pressure test gauge. If you look at it, it comprises two bolts in one. Does anyone know the size of the service bolt or the hole it screws in to? Can a permanent fuel pressure gauge be installed by simply removing the service bolt and screwing in a line or a fuel pressure gauge sender?
1TITENSX said:
Page 11-87 in the service manual says it is a 6mm.

I read the same thing. Aren't these connections normally sized as AN or NPT? I was expecting the hole to be something like 4AN or 1/8 NPT. Is the service bolt not a standard fuel hose type size?