Alright first things first I’ve been going through forums trying to find answers without having to start a thread but I’m frustrated. I gutted my car and depinned my harness to clean up the interior. Everything works except my speedometer lights and tach lights but my blinkers, check engine light, headlights and etc work. I’m sure it’s the dimmer switch as I poked around with my multimeter and have no power to my switch or to my relay. But I do have power to my cluster and I switched out all my cluster bulbs as it was probably high time anyway. So i think it’s a ground and I looked around and I have the ground hooked up by my left foot and I have grounds on either side of my fuse box. I’ve tried to find some wiring diagrams but that’s frustrating as well so I need some help.

I did check to see if my dimmer was just on low too

 

There is also a small ground that goes from the dash harness to the steering column support. I'm not sure if it would impact your lights or not.