Pressure sensor for low viscosity fluids, medium flow

I have a prototype application where we will move shea butter (83.9 cSt) from a 3 gallon reservoir through a peristaltic pump to a manual dispenser hand piece. I need the pressure sensor to turn the pump on when the pressure is under the set limit. The Shea Butter should dispense at a rate of around 24 ounces per minute.