Ok first thing you need is a output circuit off the input/ output connector, I do not run ac so I used the wire that was dedicated for the ac shutdown as my speed output, that wire will go to your DD box for your speed input signal ( this will be the only wire needed to make things work )
Once you decide what wire you will dedicate as your speed output from the input/output connector you will need to go into the terminator software and un assign that wire as whatever holley had it setup as by default ( this will be under pin map in the view outputs tab connector J1 ) I drug ac shutdown up to the unassigned outputs box and replaced it with speedo. Doing this enables pin b10 as a speed output signal
Under the transmission tab make sure you have the speed output enabled under speed calculation also. Mines is set at 4000ppm but i think i got that number off the DD gauges after i did the speedo calibration. While under the transmission tab there should be a inputs/ outputs tab to the left of the screen, click on that and under transmission outputs ecu pin should now read "j1-b10" and output type "pwm"
This should be all that needs to be done inside of the terminator software, once you start the speedo calibration inside of the gauge cluster as soon as the car starts to move you should see the ppm start to count.