I think his comment was it jumped over the place, but his issue was blown hg, so the other cylinders pressure would jump to the one tested giving the funky reading....
For 25 id try it, if it no worky take the sob back.
I have not used them on the 7.3 but I've used them on the sportbike engines and they seem to work well for what they are. Can't complain to much for that kind of $ LOL
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