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Lets face it, cruise control installation in GU Patrol is a bit of nasty joke, factory setup is just pathetic and until now most aftermarket units were overpriced with no self instalation option.
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Worry about it once you have the needle valve in. Whilst the needle valve controls spool up and mid range boost it still affects max boost to a point.

Was doing my head in adjusting the dawes and needle valve when I first installed it, ended up being MAF issues and once I sorted a replacement it was a lot better. Trying to get the same psi ranges...

Sometimes but certainly not always you need to slightly stretch the spring on the Dawes to get enough spring pressure to get the boost up.

you need to get your boost up to 10 psi for 100kph, your max will be around 15-18 psi with spikes to 20 maybe.
After you have your boost set right adjust the needle valve for your spool up rate...

Engines covered;
TB42S
TB45E
TB48DE
RD28ETi
ZD300DDTi
TD42Ti

Thanks to Todd, we now have the full Nissan Patrol Gu Y61 service manual including the following supplements.