Help needed to re-install sensor on Audi 4000 CS Quattro

[Brock Husby]

Hi Everybody,

I have an 1986 Audi 4000 CS Quattro (with the red leather interior  
that was included on the commemorative edition Audi) that I primarily  
keep in storage and maintain as a collector car, as I have a lot of  
sentimental attachment to it and want to continue to restore it.

A long time ago, I removed the value cover to re-paint it, and I  
found out later that there was a sensor that I didn't re-install and  
I don't have a manual or any guidance on which sensor it is or where  
it goes to re-install it (when I did this valve-cover painting, I  
didn't know nearly as much about cars as I do now, so my ignorance is  
coming back to haunt me!)

I took pictures of the misplaced sensors and placed them on the web  
in the hope that somebody from the digest could tell me what this  
sensor is and how and where to re-install it!

http://www-personal.umich.edu/~bhusby/Audi 4000 Sensor_1.jpg
http://www-personal.umich.edu/~bhusby/Audi 4000 Sensor_2.jpg
http://www-personal.umich.edu/~bhusby/Audi 4000 Sensor_3.jpg

Thanks again for your help!

Take care,

- Brock
   bhusby at umich.edu