WHEN USING THIS FUNCTION, YOU CAN NOT AT THE SAME TIME USE AUX-2
The Controller can drive a Mercedes Speedo.
The 8 pin plug on the back of the speedo has to be connected like this, the pin used is only the 3 down to the Right
Black = Ground
Yellow signal from Controller “TachoOut” (need to change to Speedometer)
Red = 12V
If you have an R129 Speedo it is pin 1 & 12 you have to use
On the below type it is different, Found on internet, have not tried it myself, own risk
sensor for electronic speedometer - ( :. )-
Up left pin is #3pin - white wire - sensor signal,
Down left pin ie #4 pin - brown wire - ground,
Down right pin is #2 pin - black/violet/red-dot wire - +12V terminal 15 ....
wis record - ra54001240252x (54-0252)
Signal out for the nerds :-)
“Setup Menu” -> “Tacho out”
Can be set to different value if the speedo shows too little make the number higher. start width the number “15”
If set to “1” then a test signal 100 HZ is send out, should show around 70 - 80 km/h on the speedo.
If set to “-3” then the speed will go between 0 - 250 ONLY for testing
Michael Stubberud from Sweden has now tested this speedo from E500, and confirmed it workes like this
W126 old S class
Red short is Old starter lockout
Left button is Speedo from controller
Right button is ground