Measuring Fuel Pressure

[Griffith500user]

Has anyone tried measuring fuel pressure on their Speed Six? I'm looking to tee-in a gauge temporarily and wondered if anyone had done this and could suggest the best 'teeing' location and what kit they knocked up to make the kit?

I'd imagine either a double banjo bolt at the fuel rail inlet or use the blank at the other end of the fuel rail to make an adapter?

Any thoughts and images of their installation would be ideal - thanks