VMS Racing LIQUID FILLED 1 1/2" (38.1MM) O.D. mechanical 0-100 PSI fuel pressure gauge AND ADAPTER for the GM LS1, LS2, LS3, LS6, LT1 and L98 engines. This comes with the fuel rail adapter that fits on the Schrader valve. Basically every GM V8 fuel injection car since the 1985 Corvette 5.7L L98 TPI engine has a Schrader valve to be able to check the fuel pressure. All you need to do is unscrew the insides of the Schrader valve with a Schrader valve tool, or very small pliers (not included) and then mount the adapter and mount the gauge to the adapter. Gauge can be used as a fuel pressure, oil pressure, air pressure etc... gauge. Gauge will bolt on to a 1/8" NPT female port.

VMS engineers designed this gauge to be the ULTIMATE liquid filled gauge for many reasons:

1- PERMANENTLY SEALED UNIT: Unlike basically EVERY other 1 1/2" in line gauge on the market, the VMS Racing gauge is permanently sealed, the plug can not be removed and will not leak. It does not have a removable rubber plug on the back, which always leaks and can be a fire hazard! Removable, leaky rubber plugs are BAD IDEA!
2 - NICKEL PLATED FOR CORROSION RESISTANCE: Nickel plating prevents corrosion of the gauge, will look great for years to come!
3- VACUUM SEALED FOR ACCURACY: Gauge is vacuum sealed so that it will be minimally affected, or not affected at all by temperature changes. As you probably know, liquid filled gauges will vary the reading depending on the temperature, because of the expansion and contraction of the liquid inside the gauge. Since this gauge is vacuum sealed this issue is almost non-existent in these gauges!