Legacy speedometer not working

I have one more question for you all, you were so help full last time.

I have a problem with the same legacy in the last post. The speedometer works intermittently. There seems to be no rime or reason to it. But now it hardly works at all. I am lost on this one. I have never tackled anything like this. I can’t see a cable going to the transmission. Any thoughts?

The speedometer is electronic and it can be as simple as a loose plug bihind the dash or at the transmission.

Thank you Ed, I hope it is a loose wire. Thanks again.