Sierra OP72533 Oil Pressure Sender, Universal Automatic Low-Oil-Pressure Fuel Pump Safety Switch
Sierra OP72533 Oil Pressure Sender, Universal Automatic Low-Oil-Pressure Fuel Pump Safety Switch
The Sierra OP72533 is an oil pressure sender built to protect gasoline and diesel marine engines equipped with an electric fuel pump. It monitors engine oil pressure and automatically shuts the fuel pump off if oil pressure drops too low, helping prevent engine damage from running with inadequate lubrication. The sender uses a normally closed contact and automatic operation mode, wired with a simple 3-wire hookup to the starter, pump, and ignition circuits, and is identified by sender code E for correct wiring reference.
Construction is stainless steel for durability in the marine environment, with a 1/4 inch spade terminal for a secure electrical connection and a white housing. It is a panel-mount, universal-fit sender designed to work across a range of marine engines rather than one specific model, making it a straightforward replacement or upgrade part for engines that use this style of low-oil-pressure safety switch. Sierra builds this sender to meet or exceed the performance of the original equipment part it replaces, so it installs and functions as a direct equivalent for engines requiring this type of pressure-sensing fuel pump shutoff switch.
Specifications
- Brand: Sierra
- Manufacturer Part Number: OP72533
- Switch Type: Pressure Switch (Oil Pressure Sender)
- Operation Mode: Automatic
- Contact Type: Normally Closed
- Connector Type: Spade
- Terminal Type: 1/4 inch Spade
- Sender Code: E
- Wiring: 3-wire hookup to starter, pump, and ignition
- NPT Thread Size: 43104
- Material: Stainless Steel
- Color: White
- Mounting Type: Panel Mount
- Fit Type: Universal
- Compatible Devices: Marine Engines
- Item Dimensions: 4 x 1.25 x 5.12 inches
- Weight: 0.31 pounds
Fitment
Universal fit for marine engines using this style of low-oil-pressure fuel pump safety switch; not limited to a single engine make or model.
Replaces (OEM)
No verified OEM cross-reference numbers are available for the OP72533 sender.
Frequently Asked Questions
What does the Sierra OP72533 oil pressure sender do? It monitors engine oil pressure and automatically shuts off the electric fuel pump if oil pressure drops too low, helping protect the engine from running without adequate lubrication.
Is the OP72533 a normally open or normally closed switch? The OP72533 uses a normally closed contact type, which opens the fuel pump circuit when it senses low oil pressure.
What is the sender code for the OP72533? Sierra assigns sender code E to the OP72533 oil pressure sender, which is used to confirm correct wiring and compatibility.
How is the OP72533 wired into the boat's electrical system? The OP72533 uses a 3-wire hookup connecting to the starter, the fuel pump, and the ignition circuit.
What material is the OP72533 sender made of? The OP72533 housing is constructed of stainless steel for durability in the marine environment.
Will the OP72533 fit any marine engine? The OP72533 is a universal-fit oil pressure sender designed to work with marine engines that use this style of low-oil-pressure fuel pump safety switch, rather than being limited to one specific engine model.
What connector type does the OP72533 use? It has a 1/4 inch spade terminal connector for making the electrical connection.
What color is the OP72533 sender? The OP72533 has a white housing.
How much does the OP72533 weigh? The Sierra OP72533 oil pressure sender weighs 0.31 pounds.
Is the OP72533 mounted on a panel? Yes, the OP72533 is a panel-mount sender.
Does the OP72533 work with both gasoline and diesel engines? As an oil pressure safety sender used with electric fuel pump systems, the OP72533 is used in marine engines running electric fuel pumps in this application.
Is the Sierra OP72533 a genuine replacement part? Sierra manufactures the OP72533 to meet or exceed the performance of the original equipment sender it replaces, making it a direct-fit aftermarket equivalent.