Hello,
Does anyone have a wiring diagram for a 1999 Ford Expedition? I have been trying to find one for days with no luck. It has two 20 pin connectors on the back cannot find where all of those pins lead to on the board. (I.e. what pin goes to which light or which gauge signal wire or ground, etc.). Thanks!

 

Like these?

 

Does it not have a VSS wire or anything? How are the gauges move? Do they have a + and a - and a signal wire or no?

 

No. VSS data is sent over from the PCM via one of the data busses.

That's all microprocessor controlled inside the cluster's electronics.