Been busy with this today, ive changed the wiring on the N75 so that is no longer an issue, fitted the new N75. Replaced the oil breather pipe and mounted the ignition amp back where it belongs. got hold of an air box to butcher and came up with this... works pretty well i think.

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Problem is, its still not running right. gonna wait now for my cable to turn up so i can plug it into VagCom-lite.
Thought id sussed it but noooo.
Think i may go for a longer run to get the slick50 doing its thing and see what the temp gauge is doing. i had it running for a good 1\2 hr earlier and the temp gauge was sitting at 90 and the fans were kicking in every now and then. would it do that with a faulty thermostat?? Also the air temp from the blowers was red hot but on the way home earlier when the gauge was reading low the air was a fair bit cooler. Do you have to remove the alternator to get to the thermostat. looks a bit of a b*tch to get at.