Abstract: A control system and method is disclosed for a plaster pump 10. A pair of nozzles A, B dispenses material pumped from the nozzle and are connected by a "Y"-branch 50 in supply lines 11a and 11b to pump manifold 10a. Actual pressure signals 14a are compared in a comparator 16 to preset pressure signal 28. A differential pressure signal 16a is delivered to a signal switch 34 which controls a throttle driver 38 to control throttle 40 and pump 10. The pump may be throttled up or down to satisfy the pressure difference and bring the pressure to the desired preset pressure. An actual pressure signal 14c is delivered to an overpressure comparator circuit 26. An upper pressure limit signal 28a is compared to actual pressure by comparator 26. If an overpressure condition exists, an overpressure signal 26a is sent to signal switch 32 which shuts off or idles down the pump. If either nozzle A or B is shut off, a nozzle-off signal at 64a is sent to logic controller E.