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For Don Gordon,

I used the same dual gauge you are and it performs nicely. The connection
you are looking for should be a 90 or 45 degree -4 fitting slightly down
and to the right form the temp sensor location when viewed from the rear of
the engine. Its probably only 3 or 4 inches away from the temp probe. It is
not part of the oil filter adapter assy but screwed into the accessory
housing itself.  I would think that all models of 320 / 360 would have this
fitting or at least have the hole plugged.  You should not use the oil
cooler line for pressure measuring though because its only in use when the
temp rises above 180 degrees F.

Good luck !

Lloyd