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