[Chris AFX]

I use Tomy AFX lap timers, they give a choice of race laps or time, they also give fastest lap and all lane lap times. They count down to the start with coloured lights and sounds and warn of false starts. They have a reed switch below each lane that registers the car's traction magnets.      You can connect them together for multi lane tracks. I have converted mine from battery to mains power with a small transformer.