Description A fuel pressure gauge is essential to monitoring the health of your fuel delivery system.  Mod Mafia makes it easy to add this important gauge to your Hummer / H1 / HMMWV. The Fuel Pressure Gauge Adapter provides a 1/8″ NPT port for connecting a fuel pressure sensor right at the injection pump. This product is not specific to any particular vehicle.  Select by Stanadyne injection pump version:  DB2 (mechanical) or DS4 (electronic). DS4 version pictured.