There are tach stripes on the one motor in the picture. There should be a tach reader somewhere on that motor. Check to make sure there are no broken wires going to it and that it hasn’t separated from where it was mounted.
One note, it looks like at least one wire was pinched that goes to the shell (probably for lighting), check it closely to see if there is any exposed copper. If there is, it might have shorted and took something out in the electronics.
