I bought an oil pressure test kit that came with 10 different adapters. Metric adapters included M10 x 1, M12 x 1.5, M14 x 1.5, M16 x 1.5, M18 x 1.5.
Volvo is apparently the only manufacturer to use an oil pressure sensing switch with M13 X 1.5 threads.
I scoured the web trying to find an adapter. The closest I could find was a brake line adapter that is for flared fittings and had 13MM thread pitch, but was a 3/8 X 24 flare fitting female. I have no 3/8 X 24 adapter and a flare fitting would leak in this application anyway.
Any ideas of where to find a proper adapter or a different place on the engine to screw in the tester that uses a more common thread pitch?
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