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For simple tach operation, connect the transducer to the fuel line to the injector (I did the one on drivers side, toward the rear of the engine, was easy to get to.). Then connect the red wire of the probe to the transducer, the white clamp to the fuel line.. and then connect the BNC. Set the...

I finally found the instructions. TM-9-2320-280-34. Section 3-19, page 3-40. Engine Injection Pump Timing. So RPMs just connect the RPM part. For timing, there is a 'timing bracket gauge' that comes in the unit toolkit ( 57K0268 ). This along with the Tach & Time will let you get the RPM...

I found a reference to another tester from the same company. This makes more sense to me: https://tinytach.com/pdf/diesel_instructions.pdf So I need to attach the transducer to an injector line, and if it's painted, I may have to sand a bit of the paint off to make a connection. Then the...

You did better than I did and found the PDF version of the manual. It came with that, but it's unclear to me where the transducer needs to be connected on the 6.5L to get an accurate result. I'm not intending to change/adjust timing, more just want to use it as a tach to check RPMs and idle speed.

It's the tach & time tester, can see it here: old gov planet link I've got a 6.5L in my 1988 M998.

Ok, I've suddenly realized I have absolutely no idea how to use this tester to monitor the RPMs on the 6.5L diesel. I'd like to use it as a tach and verify the RPMs. Does anyone have either a pointer (to a TM) or just in general how [and where] to attach this thing? All of the references I've...