The oil pressure adapter has a male 1/8-27 NPT thread to connect to the block. It has two female 1/8-27 NPT threads, one at 45 degrees for the oil pressure sensor and the other at 90 degrees for an oil temperature or other sensor.
Oil Pressure Sensor Thread Adapter, 1/8-27 NPT Port Plugs for Chevy/GM Small...
Oil Pressure Sensor Thread Adapter for Chevy Small Block Engines 305 350
Oil filter cover BMW E 36 E 34 E 30 E 32 oil pressure oil pressure sensor oil temperature sensor
