[Boatanchors] Need Info on Jackson 648R Tube Tester

[D C *Mac* Macdonald]

I recently purchased the subject tube tester.  It has
a powered test data roll chart, but no wiring exists
between the 648R itself and the roll chart.
 
Does anybody have any info on this?
 
Thanks in advance.
 
Mac, K2GKK/5
Oklahoma City