You can use all of these Phidget interface kit with Pc Lap Counter (maximum 4 Phidget interface kit can be connected), the Phidget 0/16/16 and 8/8/8 can be used
for car detection, pitstop detection, lane power, starting lights and track call.
The Phidget 0/0/4 and 0/0/8 can be used only for lane power and/or starting lights.
How it work in Pc Lap Counter:
the interface kit on a free USB port (no need to add drivers) and go in the options screen and specify for what functionality you want to use the Phidget interface kit, as you can see you can use it eather for car detection but
also for pitstop detection , track call , lane power and starting lights: