Luminous Flux Filter - VAPE 12 V AC - Vespa T5 and Cosa with Tachometer

Luminous Flux Filter for VAPE 12 V AC – Vespa T5 and Cosa with Tachometer

When converting a Vespa T5 or Cosa to a VAPE 12 V AC ignition system, the original electronic tachometer cannot simply be reused. This is because the light signal generated by the VAPE has a higher frequency than that of the original ignition system.

This compact signal filter solves this problem by halving the signal’s frequency. As a result, the original tachometer once again receives a compatible input signal and can display the engine speed correctly.

• For VAPE 12 V AC ignition systems
• For Vespa T5 and Cosa models with the original tachometer
• halves the frequency of the light current signal
• Enables the original tachometer to function correctly
• Very compact design
• Can be mounted, for example, in the steering head

Why is the signal filter needed?

The original T5 tachometer determines engine speed based on the frequency of the electrical signal. However, the VAPE ignition system delivers a higher frequency than the stock ignition system. Without adjustment, the tachometer will therefore misinterpret this signal.

The signal filter adjusts the frequency without requiring replacement of the original tachometer. This allows you to combine the benefits of a modern VAPE ignition system with the original instrument.

Connection to the Original T5 Tachometer

The tachometer is connected to the circuit board on the back via a black and a red cable. To use the signal filter, disconnect the red cable from the circuit board and connect it to the RPM signal provided by the filter.

Thanks to its compact design, the signal filter can be mounted directly near the steering head, eliminating the need to run an additional signal wire through the entire vehicle.

Alternative Using a Special Voltage Regulator

Alternatively, a VAPE voltage regulator with a separate output for a frequency-halved RPM signal can be used. In this case, the corresponding signal cable must be routed from the regulator to the tachometer. The separate signal filter, on the other hand, offers a compact solution located directly near the instrument.

Conclusion: The luminous flux filter allows the original tachometer to be reused when converting to VAPE 12 V AC. The signal frequency is processed appropriately so that the RPM is displayed correctly again.