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Message: [QUOTE="TARM, post: 1050122, member: 578"] The way to make that Harbor Freight tool #93644 ( 12 Piece Diesel Engine Compression Tester ) kit work is you need to pick up few parts but then you actually have to connect them up properly or it will not fit. Most make the mistake of trying to get the HF glow plug fitting to go in the glow plug port. It does not fit ( you could mod it but thats now how this setup works.) You are not using that part. You need the following: * M10x1 male oring boss to 1/8" NPT female fitting. Parker Store part #M10-1/8F8OHGS * 1/8" NPT female to 1/8" NPT female fitting ( looks like threaded sleeve) * Grease gun end whip ( you can get this at most hardware or auto stores as well as HF) It must be the one with 1/8 npt threaded ends (both ends) not with the QD end) Now in the HF kit you will see the end attached to the gauge has a quick detach coupling fitting. You will also find a QD adapter fitting in that HF kit. They are the ones in the bottom row. You want the one that has the 1/8" female thread. I think its the second one in from the left ( bottom row of sliver fittings) Ok now to assemble it: We will start at the glow plug attachment and work back to the gauge. Take the M10x1 o-ring boss to 1/8" female fitting and attach the 1/8" end to the grease whip. On the other end of the grease whip attach the that 1/8 female to 1/8 female (sleeve) fitting. On the other end of the sleeve fitting attach that QD to 1/8 fitting. The QD fitting connects to the QD coupling on the end of the gauge assembly. Here is how it should look. A picture is usually all it takes for the lights to come on LOL Pic is not mine but one I pulled off the net for this post but other than the a couple fittings looking to be brass its identical [ATTACH=full]140206[/ATTACH] As you can see that 10x1 oring boss fitting is short and small attached to the whip it gives you all the room and clearance needed to wiggle it into any of the glow plug ports. [/QUOTE]