Rinse the kidney beans and remove any bad ones and debris, place in a large bowl and cover with 2 inches of water. Add 2 tablespoons of salt and stir that in. Cover the bowl and let that sit for 6 hours. (These look a bit wrinkly, as I took the photo about an hour after I put them in the water.)
After 6 hours, drain and rinse the beans and place in your pressure cooker. Add 9 cups of water, 1 teaspoon of salt, and the 2 tablespoons of cooking oil, this keeps the beans from foaming so do not skip the oil.
Place the lid on the pot, add the weight (jiggler), and bring the heat up to high. When the jiggler starts moving and releasing pressure, start timing this for 8 minutes, and turn the heat down to just maintain the jiggler moving and releasing pressure.
At 8 minutes, turn off the heat and move the pressure cooker to an unused burner and allow a natural release of pressure. When the pressure is released, open the lid, use beans as needed in other recipes.
Drained and ready for use in a recipe. (I will be making a pot of chili with these.)