[stical]

Spektrum has this option if you've got the telemetry set.
Look at the section Lap counter

http://www.spektrumrc.com/Articles/A...ArticleID=1536

The sensor

http://www.spektrumrc.com/Products/D...ProdID=SPM1453

The trigger

http://www.mcmracing.com/catalog/pro...ucts_id=407450