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If you are looking to install a fuel pressure gauge, they do make 2 ways of doing this inside the car.... one is a electric fuel pressure gauge... just has a sensor (similar to the oil pressure sensor) which you would mount... The other is to use a mechanical fuel pressure gauge and to use an isolator, which only has fuel flow to the isolator, then after that it pressurizes a hose with something else (not sure, could be just air) but not fuel.... into the passenger compartment to your fuel pressure gauge...
Cliff Scott
89 740 16v
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