Speed / Reference / Knock Sensors

Genuine Porsche G50 gearbox speed sensor for the 911 Carrera 3.2L and 930 Turbo 3.3L applications listed below. This pulse sender forms part of the vehicle's speedometer system.

Fits

• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1978-1989 3.3L Turbo (930)

What This Product Does

The sender supplies the electrical speed signal used by the speedometer. It is a gearbox-related vehicle-speed component, rather than an engine reference or knock sensor; those components perform different monitoring tasks.

Functions

• Provides a pulse signal for vehicle-speed indication.
• Connects gearbox speed sensing with the speedometer system.

Technical Details

• Brand: Genuine Porsche.
• Application: G50 gearbox speed sensing.
• Supplied part references: 91160691001 and 91160691002.

Symptoms of Fault

Intermittent electrical behaviour, damaged cable insulation or corroded connections warrant investigation. Inspect the sender wiring and connectors before attributing a speedometer problem to the sensor itself.

Why Replacement Matters

A confirmed sender fault can interrupt the speed signal. Replacement addresses the defective component, but damaged wiring or poor connections must also be corrected. Matching the part to the specific G50 installation helps avoid compatibility problems.

FAQs

• Is this an engine-speed sensor?
  No. The supplied diagram identifies it as a pulse sender within the speedometer assembly.
• Does the Turbo listing cover every model year?
  The supplied fitment lists 1978-1989, while the diagram specifies 89- for this Turbo sender. Confirm the exact gearbox application before ordering.
• Should the sensor be replaced without testing?
  Check the wiring, connections and signal first. Similar electrical symptoms can have more than one cause.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91160691002

The product you are viewing cross references to these numbers

Speed Sensor - G50 Gearbox 

Restore accurate vehicle speed measurement and reliable speedometer operation with this OE Match Speed Sensor for Porsche 911 Carrera models equipped with the G50 gearbox from 1987-1989 and 1989 Porsche 911 turbo models. 

Fits:

• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1978-1989 3.3L Turbo (930)

Mounted on the G50 transmission, the speed sensor monitors gearbox output shaft rotation and generates an electronic signal that is used by the vehicle's speedometer and associated control systems. As one of the key components within the vehicle speed monitoring system, a correctly functioning speed sensor is essential for accurate speed indication and proper operation of related electrical systems.

Manufactured to OE specifications, this direct replacement sensor provides dependable performance and factory-correct fitment for maintenance, fault diagnosis and restoration projects.

What Does the G50 Speed Sensor Do?

The speed sensor measures the rotational speed of the gearbox output shaft and converts this information into an electrical signal.

Its primary functions include:

• Monitoring vehicle road speed
• Operating the speedometer
• Providing vehicle speed information
• Supporting odometer functionality
• Assisting vehicle electrical systems
• Delivering accurate speed readings
• Maintaining factory instrumentation performance

Without a functioning speed sensor, the vehicle's speed indication system cannot operate correctly.

Why Do Speed Sensors Fail?

Speed sensors are exposed to heat, vibration, moisture and years of continuous operation.

Common causes of failure include:

• Internal electronic deterioration
• Heat-related ageing
• Wiring damage
• Corrosion of terminals
• Moisture ingress
• Gearbox contamination
• Physical impact damage
• Age-related component failure

As the sensor ages, signal quality can deteriorate, eventually leading to inaccurate readings or complete failure.

Symptoms of a Faulty Speed Sensor

Common warning signs include:

• Inoperative speedometer
• Erratic speedometer readings
• Intermittent speed display
• Odometer malfunction
• Speedometer needle fluctuation
• Electrical fault diagnosis issues
• Loss of vehicle speed signal
• Dashboard instrumentation faults

In many cases, the speedometer may work intermittently before complete sensor failure occurs.

When Should the Speed Sensor Be Replaced?

Replacement is recommended when:
Diagnosing speedometer faults
Speed readings become erratic
The speedometer stops working
Replacing damaged wiring
Carrying out gearbox repairs
Performing preventative maintenance
Restoring a Porsche 911 or 911 turbo
Electrical testing confirms sensor failure

Many Porsche specialists replace ageing sensors when undertaking transmission refurbishment work.

Why Replacement Matters

A functioning speed sensor is important for both safety and vehicle usability.

Benefits of replacement include:

• Accurate speedometer readings
• Reliable odometer operation
• Improved electrical system functionality
• Elimination of intermittent faults
• Enhanced driving confidence
• Reliable vehicle speed monitoring
• Improved restoration quality
• Factory-correct performance

For classic G50-equipped Porsche models, maintaining reliable instrumentation is an important part of preserving the driving experience.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91160691002

The product you are viewing cross references to these numbers

Tensioner spring for speedometer impulse sender.

Fits:
Porsche 911 1974-77 - Models with electronic speedometer.
Porsche 911 1978-89 
Porsche 911 Turbo (930) 1975-77 
Porsche 928 1078-91

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91566050901

The product you are viewing cross references to these numbers