Put the water temp sending unit on my neighbor's slant and it hit me that I couldn't recall installing the oil pressure sending unit. I've looked all over (at least where I can see with the header, intake, carb, a/c comp, p/s pump, and other stuff on there now).
Just where is it on a 225? I've been through my 67 service manual, but it doesn't show it anywhere.

It is just below the oil filter on the filter mounting point. Kind of hard to miss it if you get under the car and look up.

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

Thanks.

Ok, so the pressure sending unit is actually on the oil pump, and not the block itself, right?
The new oil pump has a bolt coming out of the "point" that is just below the filter mounting pad. The bolt is replaced with the sending unit, correct?

Correct.