I am looking for a nice fuel pressure gauge that installs INSIDE the car. The ones that attach directly to the fuel rails look very stylish, but I'd be a bit more inclined to have one where I can constantly monitor it. No telling what kind of little quirks might try to hide as soon as you pull over and pop the hood.

Any suggestions? I take it these hook in place of the schrader valve on the fuel rails the same way the direct fit ones do?

 

I believe there are "rules" about running combustibles into the drivers compartment. Maybe they're track specific but it's still good practice to not run gas inside the car.

I'm using an electronic fuel pressure gauge. More specifically I have the Nordskog digital display gauge that mounts in an A-pillar pod.
In order to make it work I had to cut the front fuel crossover tube on the fuel rail, weld in a block that was tapped for the fuel sender module, and then wired it up from there. It all fits underneath the plenum. It's out of sight, no fuel in the pass compartment, and I still have access to my schraeder in case I feel like hooking up my mechanical gauge.

 

You can use an electric gauge, or you can use any mechanical gauge you want with an isolator.