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- Vespa Classic
- Fuel Tank Sensor -RMS- PX (1984 and later) - Metal Cap (50–270 ohms)
RMS fuel sender for Vespa PX models built in 1984 or later with a metal cap – resistance range 50–270 ohms.
Replica fuel level sensor for Vespa PX models from 1984 onward with a fuel gauge and metal cap. The sensor operates in the range of 50 to 270 ohms and can be used as a replacement for a defective original fuel level sensor.
This allows the practical fuel gauge to be restored to working order. The sender can also be used, with the appropriate modifications, in conjunction with compatible PX/LML instruments or a suitable separate gauge.
RMS PX from 1984 onward 50–270 ohms Metal cover Install with care
The build quality of this aftermarket sensor is significantly lower than that of the original Piaggio part. Unfortunately, as things stand, this version is the only replacement option currently available on the market for the corresponding tank with a sheet metal cap.
Therefore, take special care during installation: work gently and do not apply unnecessary force to the sender, float arm, connection area, or cap. Before final installation, carefully check that the mechanism moves freely.
The float follows the fuel level in the tank and changes the electrical resistance via the sender. The connected instrument evaluates this resistance and uses it to display the approximate fuel level.
The resistance range for this model is 50–270 ohms.
Especially on older PX Lusso models, the fuel gauge often no longer functions reliably, even though the instrument and wiring are still in good condition. A worn-out or defective fuel level sensor is a possible cause.
This RMS sensor allows you to replace the corresponding sensor with a metal cover without having to replace the entire fuel tank.
The fuel level sensor is supplied without a multi-pin connector for connection to the vehicle’s wiring harness. The existing connector from the old fuel level sensor must therefore be reused.
The individual contacts in the connector are secured by small metal locking tabs. Carefully push back or bend back these tabs before pulling out the contacts, and ensure they snap back into place correctly when inserting them into the old connector.
In addition to the standard or compatible PX and LML instruments, the resistance signal can generally also be used for custom-built fuel gauges, provided their electronics are calibrated to the sensor’s resistance range.
| Manufacturer | RMS |
|---|---|
| Component | Fuel Tank Sensor / Fuel Level Sensor |
| Vehicle Series | Vespa PX, model year 1984 and later |
| Cap | Metal cap |
| Resistance Range | 50–270 ohms |
| Connector | Not included; reuse existing multi-connector |
| Version | Replica |
The RMS fuel level sensor (50–270 ohms) with a sheet metal cover is particularly relevant because there is currently no high-quality alternative available for this PX model. It allows a malfunctioning fuel gauge to be put back into service, but does not match the quality of the original Piaggio sensor.
Anyone installing it should be aware of this limitation and take particular care during installation and connection. When installed correctly, it is a practical replacement solution for a fuel level sensor that is otherwise difficult to replace.
