{"product_id":"marine-oil-pressure-safety-shut-off-switch-sender-code-e-1-4-18-npt-1-4in-spade-terminal-mpn-op72533","title":"Sierra OP72533 Oil Pressure Sender, Universal Automatic Low-Oil-Pressure Fuel Pump Safety Switch","description":"\u003cp\u003eThe 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.\u003c\/p\u003e\u003cp\u003eConstruction 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.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e OP72533\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitch Type:\u003c\/strong\u003e Pressure Switch (Oil Pressure Sender)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation Mode:\u003c\/strong\u003e Automatic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContact Type:\u003c\/strong\u003e Normally Closed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector Type:\u003c\/strong\u003e Spade\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Type:\u003c\/strong\u003e 1\/4 inch Spade\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSender Code:\u003c\/strong\u003e E\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring:\u003c\/strong\u003e 3-wire hookup to starter, pump, and ignition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNPT Thread Size:\u003c\/strong\u003e 43104\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Stainless Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e Panel Mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit Type:\u003c\/strong\u003e Universal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Devices:\u003c\/strong\u003e Marine Engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 4 x 1.25 x 5.12 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.31 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eUniversal fit for marine engines using this style of low-oil-pressure fuel pump safety switch; not limited to a single engine make or model.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cp\u003eNo verified OEM cross-reference numbers are available for the OP72533 sender.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra OP72533 oil pressure sender do?\u003c\/strong\u003e 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the OP72533 a normally open or normally closed switch?\u003c\/strong\u003e The OP72533 uses a normally closed contact type, which opens the fuel pump circuit when it senses low oil pressure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the sender code for the OP72533?\u003c\/strong\u003e Sierra assigns sender code E to the OP72533 oil pressure sender, which is used to confirm correct wiring and compatibility.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the OP72533 wired into the boat's electrical system?\u003c\/strong\u003e The OP72533 uses a 3-wire hookup connecting to the starter, the fuel pump, and the ignition circuit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the OP72533 sender made of?\u003c\/strong\u003e The OP72533 housing is constructed of stainless steel for durability in the marine environment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the OP72533 fit any marine engine?\u003c\/strong\u003e 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat connector type does the OP72533 use?\u003c\/strong\u003e It has a 1\/4 inch spade terminal connector for making the electrical connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the OP72533 sender?\u003c\/strong\u003e The OP72533 has a white housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the OP72533 weigh?\u003c\/strong\u003e The Sierra OP72533 oil pressure sender weighs 0.31 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the OP72533 mounted on a panel?\u003c\/strong\u003e Yes, the OP72533 is a panel-mount sender.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the OP72533 work with both gasoline and diesel engines?\u003c\/strong\u003e 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra OP72533 a genuine replacement part?\u003c\/strong\u003e Sierra manufactures the OP72533 to meet or exceed the performance of the original equipment sender it replaces, making it a direct-fit aftermarket equivalent.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988458189019,"sku":"SIE-OP72533","price":19.13,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/OP72533__28268.1722489165.500.750.jpg?v=1785189109","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-oil-pressure-safety-shut-off-switch-sender-code-e-1-4-18-npt-1-4in-spade-terminal-mpn-op72533","provider":"Good Vibes Marina","version":"1.0","type":"link"}