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My own analysis of this condition sidestepped the "mechanical gauge verification" because I had some evidence (based on some 20W-50 Castrol bottle found in the trunk) the PO left me this problem. I think you'll find the B21 and B23 cars use 1/8-27 NPT (National Pipe Thread) with a standard taper that all the gauges of that era used -- nothing exotic.
The square o-ring at the delivery pipe seems to be a common problem. Here's how I dealt with it: Volvo 240 Oilpan
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Art Benstein near Baltimore
Women and cats will do as they please, and men and dogs should relax and get used to the idea. -Robert A. Heinlein
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