LOL, i can take 2 pics and write a paragraph, and that's about all that's necessary to explain how to make this type of cable. it's just that easy.

that link though..... quite interesting. it would require converting from UART to USB(or UART to serial) to use it with a computer(could use the adapter i listed earlier from the looks of it), but since it uses ELM327 instruction sets, it can be used with tunerpro to do some basic logging at least...

however, if the "large memory buffer" turns out to be large enough, it COULD be used to flash the PCM as well.... with the right software anyways, but that's always been the hard part.