Hi rsimoes,
I endorse the dash-mounted gauge as a diagnostic tool.
Engine quit! Since I had a fuel pressure gauge, I could watch it, and discovered it went to zero right before the engine stopped! Turned out to be a loose wire on the fuel pump. Without the gauge I wouldn't have had a clue whether it was electrical or fuel.
Also, cornering. I have EFI so it is important not to uncover the pickup in the tank during cornering. I can now tell when I need to stop and add some gas! A hard corner can cause the fuel pressure to drop - gotta get a fuel cell one of these days
I got a marine unit - electrical - from Nisonger. Easy to install, no worries about leaks
Tom