Re: Any info on how to use Relay gauges BGT No.1
One very useful document on PO3000 relays, including the use of some of these special tools, is A.P.2487 Vol 1, Section 2, Chapter 2. Although an Air Ministry document, I suspect it may well be a Post Office document with an AM 'front sheet'.
The only place I can find this online is in the Wireless Set No. 19 archive, so you need to be registered to be able to download the password-protected file. (Please don't shoot the messenger!)
Andy
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