Mercury MerCruiser Quicksilver — Oil Pressure Sensor Kit — 8M0210755
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Mercury MerCruiser Quicksilver Oil Pressure Sensor Kit 8M0210755
Mercury MerCruiser Quicksilver 8M0210755 is a genuine OEM oil-pressure switch and sensor kit for select MerCruiser gasoline engines equipped with an electric fuel pump. In these applications, the switch provides the pressure-dependent electrical connection used by the fuel-pump control circuit.
Compatible Applications
- Select MerCruiser 4.3L and 4.3LX GM 262 V6 engines
- Select MerCruiser 5.0L GM 305 V8 engines
- Select MerCruiser 5.7L GM 350 V8 engines
- Select 4.3L Gen II and 4.3L or 4.3LX Gen+ applications
- Alpha and Bravo applications where the OEM diagram specifies this oil-pressure switch
Serial-number fitment: Verify the engine serial number before ordering. Published application diagrams show 8M0210755 through serial 0M330610 for select 4.3L engines, 0M330622 for select 5.0L engines, and 0M331443 for select 5.7L engines. Later applications may use 8M0070108.
Part Details
- Current OEM part number: 8M0210755
- Alternate reference: 87-8M0210755
- Brand: Mercury MerCruiser Quicksilver
- Product type: Oil-pressure switch and sensor kit
- System: Electric fuel-pump control circuit
- Replaces: 805024
- Earlier OEM reference: 864252A01
- Condition: New
Kit Contents
- Replacement oil-pressure switch or sensor
- Connector with pigtail wiring
- Spade connectors
Key Features
- Genuine OEM service kit
- Designed for select MerCruiser V6 and V8 gasoline engines with electric fuel pumps
- Supports replacement of earlier oil-pressure-switch connections
- Includes wiring components needed for the updated connection
When to Replace This Kit
Replacement may be appropriate when diagnosis identifies a failed or internally open fuel-system oil-pressure switch, intermittent electric fuel-pump operation, corroded terminals, damaged connector wiring, or an older 805024 or 864252A01 switch requiring replacement.
Installation Notes
Disconnect battery power before servicing the engine electrical system. Identify the fuel-system oil-pressure switch rather than the separate gauge sender or audio-warning switch. Follow the applicable MerCruiser service manual and wiring diagram for the exact engine and serial number.
Technical FAQ
Is this the oil-pressure gauge sender?
No. On the specified applications, 8M0210755 is associated with the electric fuel-pump control circuit. The gauge sender and audio-warning switch perform different functions.
Why is the serial number important?
MerCruiser used more than one switch within the same displacement families. Later production may specify 8M0070108 instead.
Does the kit include wiring parts?
Yes. The kit includes a connector with pigtail wiring and spade connectors.
Parts Desk Insights
Best use case: Replacing the fuel-system oil-pressure switch and its damaged or outdated electrical connection on a compatible electric-fuel-pump MerCruiser engine.
Most common mistake: Confusing this switch with the oil-pressure gauge sender or audio-warning switch. Confirm the component's function and diagram position before ordering.
Fitment guidance: Match the engine displacement, serial number, and OEM diagram. Similar-looking switches can perform different jobs, and later 4.3L, 5.0L, and 5.7L applications may use 8M0070108.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
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