mad85 said:

I look around and there are two places where you can fit a gauge to the Green (HP) line - either at the back near the fuel tank or at the FPR

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check this out https://www.landyzone.co.uk/land-rover/device-to-measure-td5-fuel-pressure.125166/

sierrafery said:

check this out https://www.landyzone.co.uk/land-rover/device-to-measure-td5-fuel-pressure.125166/

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true but nobody mentions the plug at the back (above the rear axle).

Something like this should be perfect for that location and really easy to fit and remove whenever you want (ordered one to see if im right!) :

Having testing the fp / lp swap i can say there a little difference in pickup and power at the top of the rev range. I can also see that the turbo is now boost a more, up to 1.45 Bar, where before it was boosting around 1.3 Bar. Black smoke is also less now!! Im wondering about economy will have to wait a few more days so i can do a fill up to calculate the mpg