Smoked some wires today

Think i smoked my ignition switch today. 72 Duster 318 3-speed. Car wouldn't start (no crank but brake light on for parking brake) checked battery voltage and it was at 12.8. Arc'd across solenoid and turned over.

After the first time it cranked right up with the key and I went to lunch. Finished eating and went back to the car with no start. Dash light on sometimes but heard some clicking from whatever the solenoid is in the picture over by the glove box. Then wires started smoking and I heard some crackling and arcing in the column.

Would I be correct in diagnosing the ignition switch as the failure?

Electrical stuff worked fine in accessory but burned stuff in start. I've been messing with electrical but not in the column. Had a tach going to the fuse connector on the back of the box and oil/coolant/fuel going to the open fuse spot without a fuse in it.

My tach ground under the dash had popped off but idk if that happened when I was trying to find the smoke or before. Could that have done it? Only recent electrical issue I can think of was a few days ago when the tach didn't work for a second with my door open. Shut the door and it worked fine after that. All Autometer gauges. Unplugged them to see if they were shorting or something but no change and still smoked. It was 110 today and I was in a parking lot so not great pictures. I can take more if it will help diagnose. Thanks in advance and sorry if its kind of jumbled. I'm pretty exhausted.

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