I measured the voltage coming of the sense (greeen) and ground (black) wires inside my MAC-02 computer. A linear fit to the data gives the following. voltage = 0.21 * PSIG + 1.40 or voltage = 3.07 * BAR - 1.67 At 1.8 bar this is less than 20 millivolts off previously reported values. Not bad considering the width of the needle on my guage. The value at 1.8 bar is 3.86 volts. paul timmerman