3L Nissan Patrol Dual Dawes control, non electrical 

This outlines a non electrical way of controlling a Dual Dawes system, this was sent to me by 3 bar racing (Darren Dawes) to evaluate for a Patrol. It is a very simple and reliable method.
Dual Dawes are used to assist with fuel economy, so you can run high boost and high spoolup on one side and low boost on the other, spoolup will remain the same until the low boost setting is hit, so it does not reach full potential.