That is a great picture. It is also for a 7.3. My 6.9 doesn't have all those connections.
If electric that's a safe method if mechanical you will need an isolator to isolate the fuel from the gauge so no fuel comes INTO the cabin of the vehicle.If I was gonna mount a permenant dash gauge for this then can I juat plug it into the tire valve?
That is exactly what I did do, without the hose clamp. It's just a silly way to get there. Opening the fuel system to check the pressure is a poor design. And being that as there is an auto-bleeder (at least on the later filter heads), probably not the way it was intended to be used.Just remove the valve core, slip a hose over it and a hose clamp.
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ANY common FI test gauge available at parts stores for 35-50 bucks will have the proper connection you are seeking. Gassers use a schrader valve to on fuel rails. The nice thing about a proper kit, they usually have a bleed off line that drains the fuel off instead of leaving it under pressure when you disconnect it thus spraying fuel all over the place.
I'd suggest you pick up the correct tool and add it to you collection...who knows when you'll need to diagnose an issue with a gasser that has the same port, but if/when you do...well you can deal with it.
An inexpensive kit like this can save you or friends or family a lot of headache and costs associated with diagnosing a fuel problem
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