While we are on the subject, I want to express how much I would like for the design of these switches to allow for replacement without having to discharge the entire system. Some US designs have a Schroeder valve under the switch so it can be removed and replaced without discharging.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge