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Murphy Oil Pressure Switch (OPS)
Simple ON/OFF safety switch
Shuts down engine when oil pressure drops below a set level
Used with Murphy panels like Murphy Swichgage
Typical settings:
10 PSI (small engines)
15–25 PSI (diesel engines)
2. Murphy Oil Pressure Swichgage
Combines:
Pressure gauge
Switch for shutdown
Has an adjustable contact to trip engine when pressure drops
3. Murphy Oil Pressure Sender (Transmitter)
Sends variable signal (usually resistance or 4–20mA)
Used for digital displays or control panels
Common Murphy models
Murphy 20P Series
Murphy 25P Series
Murphy OPS Series