Hazard lights for me too for the obvious reasons...
Plus a modern stereo so I can listen to something while I'm waiting for the RAC to turn up. I might hide it away somewhere or I might just live with the old/modern fusion look. The one I've bought looks quite plain anyway.
I'm also going for water/methanol injection so the old six doesn't pink on low octane fuel and a brake servo so I don't have to stamp on the middle pedal when I want to stop.
And I'm also going for a dash mounted umbrella handle handbrake because I don't want the lever under my armpit. Haven't got around to rigging that up yet though.