im with danja, having a gauge under the hood 100% of the time is a constant ruler of fuel, lets you kno the fuel pressure, with your acc on, engine on and unplug the vacum line and gives the reading of fuel at WOT. also lets you know if your fuel pump is working/priming...also lets you know if your injectors hold fuel pressure or if you have a leak..its one of the best investments you can get