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Get the reading from ebike Throttle to Motor Controller

I have purchased a ebike throttle and thought it work as potentiometer, however it's not. I couldn't get correct reading as same as normal potentiometer. The reason I am asking is I'm modifying a used scooter. The old one has only on and off control and I want to replace the throttle and more powerful motor and use another motor controller which originally has a 10K potentiometer on it. I remove the original potentiometer and connect the throttle from ebay which has same 3 wire. Unfortunately, it's not working as I thought.

Anyone has any idea or similar experience? Thanks for any suggestions.