part number questions

[daddy_yoh]

I'm trying to determine what role a specific part plays. I have a 1983 300D Turbo. The part in question is located on the firewall, drivers side, behind the brake booster, left ( looking at the firewall) of the fuse block. This apears to have vacuum ports at the top and front, two wires coming from the bottom and is approximately two inches tall and 3/4" in diameter. There are two sets of numbers - 0085450828 and VV-6E777AN.

On my car, the vacuum port on the front is not connected to anything as if it has been bypassed. What is the intended use and why would it be bypassed? If I need to reconnect this to restore performance chacteristics, what do I connect it to?

Any ideas would be helpful. Thanks! DY