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My apologies for being unable to post the diagram directly, the site has been experiencing issues!!
Answer was posted, can you not see the posting?
Posting the original once more, let me know if any problem viewing it, may have to switch to a Q and A format.
Yes, the low speed requires both, the red and orange together to the hot line from the cord.
The other 2 speeds only require 1.
On the capacitor, will need the Manufacturer and Model number of the motor to try and find what the original capacitor that is needed.
Capacitors are determined by the motor manufacturers when they design the motors.
Sorry, took a little longer to find the capacitor for this one.
It Takes a Run Capacitor------15MFD 370 volt
Or CLICK HERE at Amazon
They come in many different shapes, but all are the same.
Pick the one that suits where it will be mounted. Close to the motor as possible.