Just brought and installed a fuel pressure gauge in my car, the car drove nicely but would get warm abit quick if worked harm and would hesistate at around 70mph on a cruise before the gauge was fitted...
Fuel pressure should be at 3bar, i had 2.6bar with an uprated pump and regulator! Ive now adjusted it to 3bar and the car drives superbly, doesnt get hot once worked and doesnt hesistate at all!

I'd highly recommend one of these gauges to anybody!