The issue you'll have with a drop in reg on the territory rail is if you use a gauge the vacuum line to the brake booster has to be wrenched and zip locked out of the road. I can take a picture of mine but it's not a clean fit not to mention the back fuel injector plug is hard up against it as well. I'm using a turbosmart gauge but even the smaller GFB gauge would no doubt be in the road... If you're going for a fuel pressure sensor later on then I'd just recommend going a remote mounted reg.