Complete Longacre HotLap In Car Timing System, $150 including free shipping.
I sold my track car last fall and don't expect to have another this season, so I decided to pass this on. It's very simple system. I used to run a lot of time trial events at Lime Rock where we got a bunch of practice sessions and then three timed laps at the end of the day. With this system, I was able to get times for every lap all day long. Very easy set up and installation. The two pieces on the left mount inside the car with the cable connecting them (battery powered, nothing to wire into the car) and you set the beacon on the right anywhere along the edge of the track. You can even set up your own autocross course or circle track if you have the space.
