Dave,
good work on finding a fix for the clicking noise, I have the same problem on my r32 gtr and was planning on buying a second hand attessa unit and fitting it to my car. After reading this thread I will now just try and re-charge the accumulator that is currently on the car. Just a a quick question, what presssure did you fill the accumulator to? I read on the aristo link you posted that 1000psi seems to be norm for those cars, is that same pressure you used on you accumulator?
Thanks
Aki