An improved pulse oximeter provides for simultaneous, noninvasive oxygen status and photoplethysmograph measurements at both single and multiple sites. A loop of the strapping tape positioned around the stack is tightened, locked and cut-off from a supply roll. If the access means is closed, the robot operates in a normal mode at a first specified speed. The program driver circuit has a high-voltage transistor with a diode coupled to its gate to bear a portion of the elevated voltage after the antifuse has been programmed. An electronic controller is disposed to monitor and receive at least one input signal indicative of the operating conditions of the internal combustion engine, and adjusts at least the amount of exhaust gas recirculation.