Set Instant Pot to Sauté and select “More” setting. Once Instant Pot displays “HOT” add your sausage. Stir and brown sausage until it is no longer pink, about 5 minutes.
Add butter and stir until butter is melted. Sprinkle flour over meat and stir. Cook for about one minute while stirring.
Add milk, maple syrup, salt and black pepper. Stir, ensuring that there are no brown bits stuck to the bottom.
Press cancel on Instant Pot. Select “Pressure Cook" and adjust machine to low pressure and a time of 2 minutes. Cover the Instant Pot with the pressure cooking lid, ensuring that the valve is set to "Seal."
Once timer goes off, do a quick release by turning the Valve to “Venting.” Once all the pressure is released, open the lid and stir the gravy.
The gravy will thicken upon stirring. If you would like the gravy thicker, select Sauté and put it on the normal setting. Cook, while stirring, until desired thickness is reached.