a/c wiring on a GTD

I wonder if anyone has the wiring diagram for the a/c side of the GTD? I am referring to the original installation, small condenser on LHS of car in engine bay (now being thrown out!), with a binary pressure switch. I am in process of upgrading the system but am a bit in the dark over the pressure switch wiring.
By the way, in passing, these systems were originally charged with R12. People must have had to do conversions or use drop-ins. Any experieince here? I am using R134, but with ester oil (which does mix with original R12 oil) rather than the PAG usually specified for R134 (which does not mix).
Thanks
Peter
 
Siimon - thank you very much! Now all I have to do is understand it :) I note it is of much greater clarity than the complete wiring for the GTD - I don't suppose you have a full wiring diagram to the same standard? The one I have is hand drawn, and shows the blurring effect of multiple photo-copying.

Thanks again,
 
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