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- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
Oil Pressure Sender Unit
The Oil Pressure Sender Unit is a critical engine monitoring
component fitted to the Porsche 911 SC from 1978 to 1983. Designed to
continuously monitor engine oil pressure and transmit accurate readings to the
dashboard gauge, this sender unit allows drivers to keep track of one of the
most important indicators of engine health.
Fits:
- Porsche 911 1978-1983 3.0L / SC
Diagram ref no 45
On air-cooled Porsche engines, maintaining correct oil pressure is essential for lubrication, cooling, and long-term engine protection. The oil pressure sender unit converts oil pressure into an electrical signal that is displayed on the instrument cluster, providing real-time feedback on the condition of the lubrication system.
A faulty sender unit can result in inaccurate readings, fluctuating gauge behaviour, or complete loss of oil pressure indication, making replacement an important part of preventative maintenance and engine reliability.
What Does the Oil Pressure Sender Unit Do?
The oil pressure sender measures the pressure generated within the engine's lubrication system and sends a corresponding electrical signal to the oil pressure gauge.
This enables the driver to:
- Monitor engine oil pressure in real time
- Identify lubrication issues before serious damage occurs
- Detect low oil pressure conditions
- Verify correct oil circulation throughout the engine
- Monitor engine health during normal driving and performance use
Because the Porsche 911 SC uses an air-cooled engine with a sophisticated dry-sump lubrication system, accurate oil pressure readings are particularly important for protecting valuable engine components.
Why Does the Oil Pressure Sender Unit Fail?
Oil pressure sender units operate in a harsh environment exposed to heat, vibration, oil contamination, and age-related deterioration.
Common causes of failure include:
- Internal electrical wear
- Diaphragm deterioration
- Oil contamination inside the sender
- Corrosion of electrical terminals
- Heat-related degradation
- Vibration damage Internal sealing failure causing oil leaks
- Age-related sensor inaccuracy
As the sender ages, readings may become erratic, inaccurate, or completely non-functional.
Common Symptoms of a Faulty Oil Pressure Sender
A failing oil pressure sender unit may cause:
- Oil pressure gauge fluctuating unexpectedly
- Incorrect oil pressure readings
- Gauge reading permanently high or low
- Intermittent gauge operation
- No oil pressure indication at all
- Oil leakage from the sender body
- Dashboard oil pressure concerns despite normal engine operation
In many cases, the sender unit itself is the source of the problem rather than the engine's oil pressure system.
When Should You Replace It?
Replacement is recommended when:
- Oil pressure readings become unreliable
- The gauge behaves erratically
- The sender develops an oil leak
- During engine restoration work
- When replacing ageing engine sensors
- As part of preventative maintenance on high-mileage vehicles
- During diagnosis of oil pressure-related dashboard faults
Replacing a faulty sender restores confidence in your oil pressure monitoring system and helps ensure that genuine lubrication issues can be identified quickly.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91160611103
The product you are viewing cross references to these numbers
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924 Turbo 2.0L 1979-81
- Porsche 924 Turbo 2.0L 1982-84
- Porsche 924 Carrera GT 2.0L 1981
- Porsche 924 Carrera GTS 2.0L 1982
- Porsche 914 (1970-1976)
Fits:
Porsche 914 1970-76
Porsche 924 1978-85
Click 'Zoom in' for large parts diagram.
Diagram ref no 6
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
021919081D
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
- Porsche 914 (1970-1976)
Fits:
Porsche 356 Pre A (1948 - 1955)
Porsche 356 A (1955 - 1959)
Porsche 356 B (1959 - 1963)
Porsche 356 C (1963 - 1965)
Porsche 911 F (1965 - 1969)
Porsche 914/6 (1970 - 1972)
Diagram ref no 72
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99965900940
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
- Porsche 914 (1970-1976)
Protect the electrical connection of your Porsche oil pressure switch with this OE Match Cap for Oil Pressure Switch, manufactured as a direct replacement. Produced to OE-style specifications, this protective cap is designed to fit securely over the oil pressure switch terminal, shielding the electrical connection from moisture, dirt, oil contamination, and engine bay debris. By protecting the terminal from the elements, it helps ensure reliable signal transmission between the oil pressure switch and the vehicle's electrical system.
Fits:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
- Porsche 914 (1970-1976)
Diagram Ref No 72
With age and prolonged exposure to engine heat, oil vapours, and routine servicing, the original cap can become brittle, cracked, distorted, or may be lost altogether. An exposed electrical terminal is more susceptible to corrosion and contamination, which can result in poor electrical contact or intermittent oil pressure warning light operation. Replacing the protective cap restores the integrity of the connection, making this OE Match component ideal for Porsche maintenance, repairs, and restoration projects.
What This Product Does:
- Protects the oil pressure switch electrical terminal.
- Helps prevent moisture, dirt, and oil contamination from reaching the connector.
- Reduces the risk of corrosion at the electrical contact.
- Supports reliable oil pressure signal transmission.
- Replaces damaged, hardened, or missing protective caps.
- Helps maintain the integrity of the engine's electrical system.
- Provides an OE-style fit for straightforward installation.
Symptoms Of Wear Or Failure:
- Missing oil pressure switch protective cap.
- Cracked, split, or hardened cap material.
- Corrosion on the oil pressure switch terminal.
- Loose-fitting or damaged cap.
- Dirt or moisture around the electrical connection.
- Intermittent oil pressure warning light caused by poor electrical contact.
- Damage identified during engine servicing or restoration.
Why Replacement Matters:
- The oil pressure switch cap is a small but essential protective component that helps preserve the electrical connection between the oil pressure switch and the vehicle's wiring harness. Without adequate protection, moisture, dirt, and oil contamination can compromise the terminal, resulting in corrosion, unreliable electrical signals, and inaccurate oil pressure warning indications.
- Replacing a worn or missing cap restores protection to the electrical connection, helping to maintain dependable oil pressure monitoring and preventing unnecessary electrical faults. Manufactured as a direct replacement and produced to OE-style specifications, this OE Match Cap for Oil Pressure Switch provides reliable fit, performance, and durability for Porsche maintenance, repairs, and restoration projects.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99965900940
The product you are viewing cross references to these numbers