I don't know if the ISO is a kit, here is Mags first version of ISO built with an arduino, an LCD and an extra chip for ISO communications, not too terribly complicated if you can figure out an arduino:
OBDuinoDiagram - opengauge - Whole diagram of the Arduino board, LCD, interface - Project Hosting on Google Code
here is the original obduino arduino source code (pde) and txt notes.
opengauge - Revision 167: /trunk/obduino
you are in for a lot of work if you are new to this sort of thing.
Edit: But having these little chips at your command is worth a lot too... I use 'em for everything from vehicles to water softeners.