Belegung Stecker Tacho?

I'm investigating if pin 22 (47k "adac sequence - control") is connected to the button on the right lever of the steering wheel. The one used to browse the elements of the speedometer.
Is it available the pinout / schematic of the connector number 145?

you have PM

Thanks to an exchange with TC (I'll honor soon my part of the agreement ), now I own a speedometer for testing purposes.
Just for fun, today I did the first test: twin speedometers on my brother's Twizy.
Following the pinout published here, I connected the additional speedometer directly to the canbus OBD connector.
I wired pins 13 and 9 of 247 Twizy's connector to 12v, pin 1 to Gnd, pins 5 - 7 to Canbus H-L, and pin 22 to a n.o. button with the other contact to Gnd.
This the result:

This test confirmed that:
- more than one speedometer could coexist
- GO lamp and probably piezo are activated via the canbus
- speed data is coming from the canbus, but with some strange behaviors: some times, the displayed speed is different! May be the speed value is reworked localy in some way by the speedometer chip
- km are probably saved on the speedometer. The additional speedometer shows a mileage absolutly different to the real one of my brother's Twizy. After a short trip, the mileage growed lineary in both screen. I don't know, at the moment (need a much more long trip to verify) if there is a time when the mileage saved in the speedometer is allineated to the real one read from the canbus, but I suppose it should
- also estimated km left are different
- values for reku animation and battery graphics are taken from canbus.

Thank you very much for the information and the documentation shared here: without them I wouldn't be able to perform this test.

Next time, I'll check what happens during charging.

the milage is stored in the unit and the ECU

It is possible that two similar devices sharing the same bus can conflict, so you might see the different speeds?

All is possible.
I think the hardware of the two screens doesn't react in the same moment. One can be a little faster than the other to elaborate and show the value read from the canbus. May be for a minimal difference of the hw or of the fw version of the speedometer chip.
In the video, if I'm not wrong, when there are differences in the speed, it's always the original speedometer to show bigger value in acceleration and lower value deceleration.

I think you are right, the two Speedos might have small delays in their calculations/ displaying the value (since they don't differ all the time )

The can bus has a mechanism to avoid the collision of messages on bus. This collision pervention may be the reason that two can bus devices can not be absolut synchronous.

Verry nice explorer job from Delvecchio. I have a dream ! I am hoping for an Speedometer-Upgrade-Kit made by him . I want to scrap the original display and replace it by a nice coloured one with all the usefull ToM functions included.

Berthold schrieb: I have a dream ! I am hoping for an Speedometer-Upgrade-Kit made by him . I want to scrap the original display and replace it by a nice coloured on with all the usefull ToM functions included.

Are you reading my mind?

That's what i have suspected after reading his hope to get a Dashboard
And that's why I have started to explore my spare part container

Delvecchio schrieb: Next time, I'll check what happens during charging.

I continue my report.
I think to be on topic, because the discussion concerns the pinout connection of the speedometer. If not, feel free to move my posts elsewhere.
I first want to thank BinKino for the high valuable information shared here, they gave me the possibility to make these tests.
.
Here the video about today charging test.

I listed in the video the pinout connection, the results are visible.
Please take note that I wrongly wrote in the video pin 11 instead of pin 1.
So everywhere you read pin 11, it's pin 1 to be connected to ground. Sorry for this.
In short:
Pin 10 of Twizy 247 connector, control the waking up of the speedometer in charging mode. Since I wasn't sure about the current and polarity to apply to this pin, I put in series a 2200 ohm resistor
Keeping pin 13 connected to 12V (pin 9, not connected), if you wire pin 10 to 12V the speedometer switches on in charging mode, waiting for canbus data. As soon as 220v cable is connected, auxiliary speedometer will display charging details, like the original speedometer.
As you can see in the middle of the video, keeping pin 13 connected to 12V (pin 9, not connected), and pin 10 wired to 12V, the auxiliary speedometer switches on in charging mode, but if you turn the key to Ignition On it will be switched off, and will be On again when the key is turned back to Ignition off.