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The Murphy Selectronic MT90-1 is a digital tachometer using a quartz crystal time base and solid-state electronics for high accuracy. RPM data is supplied by a Murphy magnetic pickup at the flywheel ring gear; powered by the pickup or a 12-, 24- or 32-volt DC battery system.
The Murphy PSB-100-F20 is a direct-mount pressure switch with a 0-100 psi (0-6.89 bar) range and 20 psi factory preset. Maximum pressure 200 psi, plated steel housing, 1/8-27 NPT brass pressure connection, formed beryllium copper diaphragm, brass pulsation dampener.