Set sous vide machine to 55C/131F.
Place the tri tip in a freezer bag, and remove the air through a vacuum sealer or the displacement method. Drop tri tip in the bath for 6 hours.
In a small bowl, mix together salt, pepper, garlic powder, onion, powder, oregano, cayenne pepper, rosemary and sage to create spice blend.
Remove bag from bath. Take tri tip out of the bag, pat dry and season with spice blend. Heat pan on high and add oil. Sear for 1 to 2 minutes on each side.
Slice and serve tri tip with your favorite BBQ sauce or topping and enjoy!