Looking at gauges I have and by parallel to other parts of the engine oiling system, not from any sure knowledge, my guess is that it would be a Weatherhead fitting. See attached photos of gauge and fitting. Bob Carriere was speaking with someone (from the Kingston area?) who claimed they were available from Motion Industries Canada (in Ottawa) but that you had to buy a bag of 10 to get them. Motion also has a branch in London.
Notes: This is a 2 part compression fitting (tapered nut that fits on the line and matching socket in the gauge. (There were also fittings made with the weatherhead socket and a 1/8 pipe thread that were used on the engine block (for pressure gauge and in different size for the oil filter lines)) Weatherhead has developed into a sub-brand of Eaton for many types of fittings - no longer just the type seen here.
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