1) I'm trying to tweak my flat-dash set-up to give as much info as possible, without actually spending any money

I assume indicators and main beam are essentials, along with an ignition light - but can I lose the demist light altogether? I also have another speedo, almost the same as the original but without any labelling on the tell-tales - could I lose the oil warning light (as I'd have an oil gauge) and replace it with the indicator flasher?
2) I've also got a 70s aftermarket rev-counter pod, which I'd really like to mount atop the steering column. The only thing it would be visually obscuring is the hazard switch, although I can still reach it perfectly easily to activate. Again, is it legally necessary for the switch to be visible? Or should I swap it with the demist switch?
I do appreciate that the obvious answer to both these questions is to JUST GET A CURVED DASH, but I'm on a (very thin) shoestring budget. Any advice would be gratefully received!
