The pump I pictured is from Northern Tool, and it has a five foot hose, which sounds nice for positioning a jack and being able to pump it from a safe distance.
I remember now, that the Gauge was being used to have the jack serve as a "Scale" which is a clever idea.
What I think I missed (or conveniently forgot...) was dismantling the jack to drill that second hole, parallel to the Piston. I thought the only drilling was in from the side, parallel to the bottom of the base.
So you had to dismantle the jack, and drill down... This seems to prevent using any of the common, newer, jacks that are welded together vs. that "Big Nut on Top."
I can see where drilling the center of the bottom, and tapping the gauge in there, would work OK for a jack used in a hydraulic press, but doesn't look practical for a jack used as...a jack.
Above is a pic of the base of a jack that's been taken apart for drilling. The two 3/16" drill bits are inserted in the drilled holes for illustration of where they're drilled and how they need to meet. This person was using a jack in a press, so personally, I would have simply drilled and tapped the bottom. Vertially, right through the center in this pic.
