I bought a compression tester for diesels at www.harborfreight.com (http://www.harborfreight.com) item number 47912, thinking I was getting a really good deal. There are no fittings in the kit to interface to the 6.5 so I cut an old glow plug down until there was only threads, drilled a hole in the center and tried to adapt it. No luck. Anybody have an idea about the threads on the glow plug or injectors?

Someone claimed to have gotten npt fittings to work.