What is the difference between the 30,000PSI Fuel Rail Pressure and the 30/100PSI Fuel Pressure?

A Fuel Rail Pressure Gauge reads the fuel pressure in your diesel truck directly from the common rail to ensure it is running at optimal levels. Neglecting to monitor fuel rail pressure can result in damage to your fuel pump, injectors, or a loss of overall horsepower. Fuel Rail Pressure Gauges are only compatible with the 03-16 Dodge Ram 5.9L or 6.7L Cummins and the 02-16 Chevy and GMC with 6.6L Duramax Engine

A Fuel Pressure Gauge monitors the fuel pressure from the fuel pump to the fuel rail and or injection pump of the engine. Fuel Pressure Gauges can also help diagnose an overall loss of horsepower. (*A Fuel pressure gauge will only work if an aftermarket lift pump is installed on a 2000-2018 Silverado/Sierra Duramax*)