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your gonna want an electronic gauge. that one is mechanical. i used an electronic oil pressure gauge for my fuel pressure (way cheaper) 60 bucks at oreilys
If you want serious safety / reliability (and don't care about having wires that are easy to thread around), get the mechanical.
A lot harder to get one to read in the cab, but much more reliable and risk free vs. the electronic gauges.
Here are instructions to hook up a simple mechanical gauge --- almost any fluid dampened pressure gauge that reads at least to 100psi (cheap at any air / hydraulic shop) will do.
. Under hood mechanical fuel pressure guage
The fitting for the rear of the fuel bowl is male SAE 20 o-ring to Fm 1/8 NPT. You can find this at a hydraulics store that sells Parker fittings. About $2 to $3. While you are there you can pick up a 100PSI oil filled guage for about $8 to $10,( you can also get one from a bigbox auto parts store, it just costs a little more) and a 12 to 16 inch 1/8th NPT Male to Female hose for $5 to $7. This mod you will need some thread locker for, don't use teflon tape on the fuel system due to little pieces that may come off from the threading and clog up an injector nozzle. A bracket to hold the guage off the alternator can be fashioned from whatever strap metal you may have laying around. use the same R drill bit and the 1/8NPT tap to mount the guage to the bracket you fashion.
total cost about $20
Seth is right, you want an electronic gauge with an electronic sender and wiring. Otherwise, you'll need an isolator to keep the fuel out of the cab, and a tube running into your cab.
The stuff gearloose posted is from the 7.3L forum and doesn't apply to the 6.0L.
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