Apply liquid gasket to the Oil Pressure Switch threads. If you have a torque wrench, torque the switch to 17 Nm (12.5 ft-lb). The switch goes in tight, and it is easy to under torque it which I’m guessing would cause oil leaks.

There is a small rubber gasket on the solenoid which needs to be oiled before Installed. Install the solenoid and tighten the size 10 bolt.