EUREKA!

That dang blasted 90 deg elbow in the HF diesel compression tester that breaks oh so easily can be replaced with a 1/4" JIC elbow, much more stout. I paid ten bucks at the local NAPA(highway robbery) to have it in hand now, Amazon also has them for $2.45/ea and prime eligible.

Just spreading the word. This may be widely known already, I hadn't read it on these forums, but have seen complaints that the elbow breaks too easily.

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617 swapped Toyota Pickup, 22-24 MPG, 50k miles on swap