89V6FBIRD

So I'm in the process of installing a 140 mph cluster in our T/A. Now I have a question, the pinouts for the 85 cluster have "BUFFER SIGNAL TO ECM" and "GROUND FOR BUFFER TO ECM." I will be installing the buffer box that came from an electronic speedo car. Obviously the brown wire that come from the buffer box provide the signal I need, but there's only 1 brown wire coming from the VSS Buffer box. What is this "GROUND FOR BUFFER" supposed to be hooked into?

rgarcia63

Any connections that you know should be there such as power, & ground, and can't see are integral to the PC board traces and connectors, separate wires can be for short runs, or add-ons.
The ECM may not have existed when the buffer box was designed into the instrument panel printed circuit board.

The VSS signal is also shared with the cruise control module.