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Condezeca

Veglia rev counter showing half revs

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   Hi mates, anyone knows what to do on a Veglia that start to shows half of real engine revs? That is from my 2000 V11 Sport.

   Thanks in advance for your help

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Mine does somethnig similar, but I've only check it at idle speeds while comparing with GuzziDiag...

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It is common that the Veglia is not accurate (Vague-liar! :grin:).

If it is a sudden change, upgrade Relay #2 (and the rest!) to the "Best Relay."

Condezeca,  what did you use to compare to the Veglia?

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Just had a look at mine.

At fast idle ecu says 1100rpm, dial says 500rpm and signal going into gauge (yellow and black wire) is 34hz.

No idea what the correct frequency should be?

I am assuming it goes up with rpm as it doesn't look like a pwm signal.

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Just to follow on, 34hz is 2040 pulses per min, so for a 2 cyclinder motor, 1020rpm. Pretty close.

So given the pulse train from the ecu into the gauge is right, has anyone opened up a Veglia tacho? I would imagine a dry capacitor would cause it to read low...

 

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Low Voltage at the gauge might make it read low but I suspect it would read erratically 

The pulses to the tach come from the ECU, I doubt it would be missing pulses.

Sometimes an erratic tach is a sign of charging or headlight problems, the Tach is powered off the headlight relay which also acts as Voltage reference for the Voltage regulator, check the Voltage at the female connector of the regulator M/Fm socket.

Otherwise Rich888 might be right something inside is drifting, I just recently repaired the Veglia off my 72 Eldorado 

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