For the spindle you should only need pins 13 and 14 connected, if there were additional wires on the breakout board they could be for other things like a touch probe or to turn on a dust collector type load.
There is a post with all of the pin out info for the breakout board
The other issue I ran into was the settings for the max-spin, mine defaulted to or somehow I edited it to a value of 255 which resulted in any spindle speed value in Fusion 360 over 255 running at 24,000 RPM. Make sure it is set properly for your spindle… somehow mine was not.
