You will use two of the original three wires. Not knowing if you have a motor starter and how it is wired makes it impossible to give you details.
BE AWARE that a 7.5 HP single phase motor is going to draw a massive starting surge compared to a three phase motor. I assume this is on a 240 volt system as it would NOT be practical to use a motor that size on a 120 volt system.
Expect to require around a 30 to 50 amp single phase feed to the motor.
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