Adjustable fuel pressure regulator
 

I need some info on installing and using a
adjustable fuel pressure regulator.

If your Mustang is stock, it's a huge waste of money and time putting one on. You will not be able to control your air/fuel ratio with an adjustable fuel pressure regulator. That is completely in the hands of the computer.

If that's not what you were asking, then it would be a big help if you asked about something more specific.

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351W 89 Mustang GT Convertible