JEGS 555-63096 GM LS Swap Oil Pressure Gauge Adapter Fitting is needed when installing an oil pressure sensor or mechanical oil pressure gauge line on GM LS engine swaps. Installation is easy by threading the fitting into the oil port on the top of the engine block behind the intake manifold. This fitting can also be installed on most import vehicles when adding an oil pressure or temperature gauge if equipped with an M16-1.5 metric threaded port.