John, that was one of the nicest things you have ever said to anyone here, ["I think i just had an anuresim reading all that"]....
what is an "anuresim",
and was it good for you too?
lol just joking, now, meanwhile, back at the shop...

based upon the description of where the fuel pressure sensor is on this unit, I would say it is 2005 or newer*

*="ECU I had ordered was configured for the early version K-21 which has the LPG pressure sensor mounted atop the injector body with two 5mm screws. But the ailing K-21 I'm working with has the later version of LPG pressure sensor which threads directly into the front of the injector body".