I seen that on ebay also, if memory is correct thats an old nick named blinky box. They are used to get the correct clutch overlap setting on RPS 34 equiped 70 series tractors, in other words powershift equiped. I have serviced these trsctors for fourty yrs and never used one. A case service rep showed us how to listen to the trans during shifting and adjust them by ear and feel. I really don;t know if other service personal actually used them much. For myself I think its a neat consersation piece, but not a required addition to the toolbox. To answer your question, you need to install those 2 censors in the test ports, hook up wires, and go through the shifts . The different colored lights told you how to adjust the then called retard screws. Rod.
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