Headlight, speedometer and odometer are not working

The odometer and speedometer are most likely related, but the headlights are most likely not. So, I would suggest we start with the headlights and if that happens to fix the others then that is great. However, if not, then we most likely have a speed sensor or cluster issue.

So, let's check the voltage coming out of the relay going to the head lights.

Here are a couple of guides that will help with this:

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

I am attaching the wiring diagram below so let's start with this and we can go from there.

Thanks

Okay. Can you get a picture of the speed sensor that you replaced in the transmission? I just want to verify this was the output sensor.

Also, if this is ok then the likely cause of this is the cluster itself. This cluster has a logic circuit board that takes the speed sensor input and displays the speed and odometer. So, if this is getting a speed signal then the cluster is the likely issue.