I'm going to get a fuel pressure gauge w/o isolator. Several web sites suggest using a stainless steel braided hose to run from the isolator to the fuel system (assuming you use the isolator). Seems like overkill to me. Why couldn't you just use standard fuel hose?

 

You can... it's definately not a high pressure application. I personally went with the braided stainless steel line because I have a mechanical gauge but I don't use the isolator. I have the SS line run into the cab and went with the SS for abrasion resistance.

 

You can get a nice line from a hydraulic shop that will be the same diameter as the one from the gauge kit, but it will have a higher psi rating. You're connections are more important than the tubes pressure rating IMHO.

 

I've installed mechanical FP gauges with 1/8" nylon tubing, same kind used for boost gauges, for years without one problem in many rigs. The tubing in my own trucks is going on ten years now.
Just push the small tubing though some 1/4" tubing to form a protective sheath to protect against cuts, kinks and abrasion.
Braided hose looks cool but is a way overkill and has a tendency with vibration to saw though anything it touches.

 

I used 7' of 300psi rated hydraulic hose from NAPA. It was around $20...much cheaper than SS braided, and it'll never see even 30psi....goes through the big rubber grommet in the firewall under the master cylinder, so I'm not worried about it being worn through anywhere, and you can't see much of the line to bother having something shiny and braided.

 

I did just what Infidel said and it has worked great so far. I bought the hose from napa for 20 cents a foot it's gas and oil resistant and rated for 150 psi. It's about a standoff with steel but it will deffinatly rub through aluminum. buy about 3-4 feet of 1/4" o.d. tubing for a sheath / guide. I put the 1/4" tubing though the firewall first then just pushed the 1/8" tubing right though. It worked great. the main thing to remember is to tighten the little ferrul fittings very tight so that there is no leaks