Speed signal from abs or cruise control? to my RS8 biturbo ecu
I have an Audi S8 -97 manual with RS6 engine but I have a fault code (16885) in the RS6 ecu that it is missing a speed signal.
So were can I find a speed signal in Audi A8/S8 94-99 ?
The cruise control must have this? but i don't know cable colour or where I can find this cable in my car?
Maybe also the ABS or clima have a speed signal?
And perhaps it is an speed signal output on the instrument cluster does anyone know this?
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Owns at the moment: 
S8-97 biturbo = RS8 My new trackday car 
A8-94, A8-96, A6 1.8tq -2004
2 Urquattro 20v-90 one red, one blue,
and one old Urquattro ex rallycar,
and some other cars.. 
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