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the pressure guages use the bourdon principle
they may vary a lot in quality,
I used one for air pressure, rated at 200 PSI , a bit too high to be really accurate but its what I had in my junk box. you can buy better quality stuff, a good gauge is probably water filled.
careful with the lines and dirt because the fuel injectors dont have big holes so any dirt or stuff could potentially get trapped in here.. its usually got the fuel filter to protect it.
my ford van had an easy way , it has a pipe thread and basically a tire valve with a heavy duty valve cap.. in my volvo and maybe the porsche I thought I'd connect after the line to the rail and I might sacrifice the end of used fuel line and the end of a used fuel rail to get those metric fittings. I wonder if they are the same size, maybe, probably metric . I sure you can buy them..
I asked at the auto parts counter and he had some stuff in a kit but it looked like Chinese plastic junk to me so I just used an air guage.. not the best thing for accuracy but ok as a quick and dirty check I guess.
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