Hks afk 3 knock sensor setup

[Argyle dan]

Help,Recently purchased a hks afk 3, to go with the vpro. The instructions are so vague I'm having problems with the knock detection. I've been looking over the previous versions setups and I'm pretty sure everything's connected the way it should be. In the previous versions it says how to setup with a vpro but nothing in these, apart from which FCC to use. I've tried to use those settings as well. When I plug my headphones in all I hear is static, I would be holding the revs at 6k but nothing registers, I've set up the knock signal input,knock detection 1 & 2 but surely I would get some knock. Vpro is in piggyback configuration as well. Thanks