Strange BRAKE warning lamp issue. That lamp gets its ground from one of two switches. It might be possible for one of them to be faulty, not fully open, but can't say I've ever seen it. A small amount of connection could light up a LED but not light up a 194 enough for you to see it. If I had to guess which switch... The one that can get brake fluid in it. None of that explains its flashing with right turn.
The bare metal terminal that belongs on the oil sender needs to be insulated. If it goes to ground it would peg the gauge and eventually kill it.
