forum.audiv8.com Foren English Audi V8 Forum Speedometer sensor location or Workshop manual

It's a curious situation which I thought would be related to the instrument cluster itself.
At a guess, I would have expected the drive to be near a front driveshaft.

pm me your email address, and I will send you a link to download a copy of the manual from either my dropbox account, or that thing on hotmail/outlook.

As far as I know, there is one input for speed, and this signal is used to also drive the odo. I presumed, but haven't looked, that the odo is driven by a small motor.
However, it may be different.

I have found a few issues due to age in the instrument cluster. mainly dry solder joints, or tarnished contacts.
The Speed/odo assembly is mounted, and plugged onto the main display panel, as a module.

speedo connection