In order to install one of our Fuel Pressure gauges in your Duramax, you must have an aftermarket lift pump installed. You can use a 6.6L Pressure adapter, GS-FA_Duramax, when installing in a 2000-2013 6.6L which replaces the stock bleeder screw next to the filter housing to easily install a ⅛ - 27 NPT pressure sensor. Thread size is M10 x 1.5.
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