Yet ANOTHER treadmill conversion...

I think you are out of luck with that one.... as others have said.
However - with a bit of fiddling, you CAN control the speed and direction, stop and start with momentary push buttons.
You may find that next to the connecting cable between the controller board and the 'command console' board there are screen printed abbreviations for Ground or Common, Start, Stop, up, down and reverse, or at least some of these.
If so, to experiment, make a jumper cable with a momentary push button switch at one end and connect one wire to Grd/Com and the other to - say - up. Then plug the thing in with the motor connected and push the button multiple times. If it runs, you can then increase the speed by pushing further multiple times, up to maximum speed. Caution: plan what you will do next: to slow the motor down again, you will need to move the wire from the 'up' terminal to the 'down' and then press the button lots of times to slow the motor down again! :)
If these work, get a few more buttons and connect them similarly to stop and reverse.
Now, if it didn't work at all, and there is a 'start' terminal, you need to connect the 'start' terminal to the common as well (a direct permanent link is OK).
The biggest nuisance is that these things don't remember the last setting. So if you stop the motor, it will not start again nor run up to the last speed selected. You have to restart and re-accelerate these controllers EVERY time...
 
if you break the center wire on the pot and add start and stop switch it will come on where you stopped it last, it is called the wiper wire.
 
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