The fuel pressure gauge falls into the everything-else group of gauges - please check the gauges primer for more info.  Normal fuel rail pressures are typically between 30psi to 40psi.  This gauge is not something most people need, but it helps for tuning and troubleshooting problems.  Keep in mind that ND top-feed fuel injectors can run up to 70psi of fuel rail pressures before not seeing any more gains.

Since we're trying to monitor fuel pressures for a fuel injection applications, the pressures are on the high side.  This is one application where you'll need to go with an electronic gauge for safety.  Running a mechanical fuel pressure gauge inside the vehicle is DANGEROUS due to fuel being in the line.
Click here for the gauges primer!

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