Reset the ECU and took the car for a quick drive and on my way home the Tach stopped working simultaneously with the passenger window.

When it rains it pours.

Are they on the same fuse?

 

well by the tac should be on the room fuse which is separate from the window.

factoid the ground for the gauge is the one on top of the fuel pump cover

 

really?

 

I thought the same thing. I discovered this after I put in a custom dual pump setup. So the top cover was different, didn’t think to re hook that little ground since the tank was grounded, and I had direct leads to the battery for the fuel pumps.

After doing the swap and being like WTF, I didn’t do anything with the cluster I stared @ the wiring diagrams and realized that was the ground for the cluster. Grounded it and tadow, cluster works……