Abstract: A digital display apparatus for a fastener pulling tool to set a fastener (e.g., rivet, blind rivet or blind threaded insert), driven by pneumatic, hydraulic or pneudraulic power, includes a power supply, a CPU, a pressure sensor, position sensors, a display, and an input means; wherein the pressure sensor is operable to sense pressure of hydraulic or pneumatic fluid entering the fastener pulling tool; the CPU includes a pressure and pulling force calculation module an unit conversion module, an over pressure determination module, a cycle times counting module, and an abnormal stroke detecting module; and the display includes a pressure display zone for showing hydraulic or pneumatic pressure and a pulling force display zone for showing pulling force, a non-resettable over pressure display zone showing the highest inlet pressure, and a cycle time display zone for showing non-resettable accumulated working cycles of the tool.