Description
PAI Industries 900371 electric speedometer/vehicle speed sensor for Eaton Fuller manual transmissions, with the standard 2-pin oval connector found on FS-5406, FS-6206A, FS-6306A, and FSO-6406A gearboxes. Reads tailshaft tone-wheel pulses to feed the speedometer and ECU. Direct replacement for Fuller K-3231 and K-4148, backed by a PAI 2-year unlimited-mileage warranty.
Signs You Need a New Speed Sensor
- Speedometer reads zero or jumps erratically
- Cruise control drops out or won’t engage
- Inaccurate odometer / trip miles
- ABS or transmission fault codes referencing vehicle speed
- Engine ECU misbehavior at idle or shift points (no VSS signal)
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | 900371 |
| Part Type | Electric Speedometer / Vehicle Speed Sensor |
| Connector | 2-pin oval |
| Overall Length | 2.63″ |
| Warranty | 2-year unlimited mileage (PAI) |
Cross References
This sensor replaces or is equivalent to the following part numbers:
- Eaton Fuller: K-3231, K-4148, K-4185, A-6398, A-6724, A-7462
- Mack: 3088-K3231, 3088-K4148, 3088-K4185, 3088-A7462
- Volvo: 85137529
Applications
This speed sensor fits the following Eaton Fuller transmissions:
- FS-5406, FS-6205A, FS-6206A, FS-6306A
- FS-6406A, FSO-6406A
Representative vehicles using these transmissions:
- Class 6-8 Mack, Freightliner, International, Kenworth, Peterbilt trucks with Eaton Fuller medium-duty manual gearboxes
- School and transit bus chassis using FS-series Eaton Fuller transmissions
Verify the connector style and your transmission model before ordering. The 900371 uses a 2-pin oval connector — late-model heavy-duty transmissions sometimes use a different sensor and connector.
