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MotoGP God
Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
Posts: 13,086
Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
I bought a Mychron 4 which is a small self-contained system that is maily used with karts, but will work on anything.
It's an LCD display with adjustable everything. It includes a lap timer but you need to add the trigger, either optical or magnetic pickup. You can add extra sensors like temperature, speed, gearing, etc. It just needs a wire wrapped around the HT lead to work on revs, and is very easy to setup.
Worth a look as I paid about £45 off ebay for it!