Speed sensor wire from dash

[vex]

First and foremost for those who don't know what I'm talking about; look on page 50-40 and 50-41 of the FSM for the S4 model year. You'll notice that there is, what appears to be, a speed sensor input to the dash. The wire is Green/Red and is used in the process of the power steering, cruise control, and if you have it the Automatic Transmission. This ensures that the cruise control only functions below a specific speed. However when I attempt to figure out how it does this by looking at the dash I do not get any answers.

From my investigation I can see that the input comes from the power steering control unit that is taking readings from the A.A.S, as well as the tach (more precisely the trailing coil that feeds that tach)--50-78 for those following along.

My question is this: Where is the speed sensor (I assume it's within the dash), and how do I retain the function of the speed sensor even though I will not be running the dash?

[vex]

First and foremost for those who don't know what I'm talking about; look on page 50-40 and 50-41 of the FSM for the S4 model year. You'll notice that there is, what appears to be, a speed sensor input to the dash. The wire is Green/Red and is used in the process of the power steering, cruise control, and if you have it the Automatic Transmission. This ensures that the cruise control only functions below a specific speed. However when I attempt to figure out how it does this by looking at the dash I do not get any answers.

From my investigation I can see that the input comes from the power steering control unit that is taking readings from the A.A.S, as well as the tach (more precisely the trailing coil that feeds that tach)--50-78 for those following along.

My question is this: Where is the speed sensor (I assume it's within the dash), and how do I retain the function of the speed sensor even though I will not be running the dash?