KPALAG Oil Pressure Fuel Pump Shutoff Switch for Mercruiser V8 Engines — Direct-Fit 87-864252A01, Corrosion-Resistant

KPALAG's oil pressure fuel-pump shutoff sensor is a direct-fit replacement switch that monitors engine oil pressure and stops fuel-pump operation when pressure falls outside safe range.

This replacement sensor is built to match Mercruiser/Quicksilver engine requirements for 4.3L, 5.0L, 5.7L (305/454), 7.4L, 8.2L and 502 V8 models and cross-references OEM numbers including 87-864252A01. Constructed from flame-retardant PA plastic and stainless steel components, the KPALAG switch aims to deliver stable electrical response and corrosion resistance in marine environments. It is engineered as a direct-replacement part to simplify service and reduce downtime on boats and other applications using these Mercruiser engines.

How does this sensor integrate with my Mercruiser engine?

The KPALAG switch is designed to match the original equipment specifications so it connects to existing oil pressure circuits and fuel pump shutoff wiring without modification. Its electrical terminals and thread size are compatible with the same mounting and harness locations used on the factory sensor.

• Direct-fit for listed Mercruiser V8 engines and mounting points
• Compatible with OEM wiring harnesses and connectors
• Replaces part numbers 87-864252A01, 87-805024, 87-8M0070108, 87-864252

What performance and durability features does the KPALAG switch offer?

The sensor uses flame-retardant PA plastic for the housing and stainless steel for wetted metal parts, improving resistance to heat and corrosion common in marine engine bays. That construction gives a reliable electrical response and extended service life compared with cheaper, untreated components.

• Flame-retardant plastic housing for thermal safety
• Stainless-steel contact surfaces for corrosion resistance
• Engineered for consistent electrical switching and accurate pressure response

Will installation require special tools or adjustments?

Installation is straightforward because the KPALAG sensor is a direct replacement; no special calibration or programming is needed. Typical installation requires basic hand tools to remove the old switch, inspect the mounting area, and secure the new part with the correct torque to avoid leaks.

• Simple remove-and-replace procedure—no special tools required
• Follow OEM torque specs to avoid thread damage or leaks
• Inspect electrical connectors for corrosion before reconnecting

How does this switch help with oil-pressure indicator problems?

When oil pressure falls below the sensor's setpoint, the switch opens the fuel-pump circuit to reduce the risk of running the engine without proper lubrication. Replacing a failing or stuck switch often resolves a persistent oil-pressure warning light caused by sensor faults rather than the oil system itself.

• Detects low oil pressure and interrupts fuel pump power as intended
• Useful diagnostic step when warning light or pump behavior is abnormal
• Helps prevent continued fuel delivery during low-oil-pressure events

Who is this for: Boat owners, marine technicians, and DIY mechanics who operate or service Mercruiser/Quicksilver V8 engines (4.3L–8.2L, including 305, 454, and 502 variants) and need a reliable, OEM-cross-referenced oil-pressure fuel-pump shutoff switch. If you require a straightforward replacement for part numbers such as 87-864252A01 and want corrosion-resistant materials and a plug-and-play installation, the KPALAG switch is built for that use.