instrumentation amplifier How to Read Wheatstone Bridge negative voltage with Arduino

A half bridge setup with strain gages and a INA126 to amplify the voltage. I can read the voltage fine when the lever is bent one way, but when beding the lever in the opposite direction I don`t get any reading. I`m guessing it`s because the voltage is negative. Is there a way to read the voltage when the lever is bent in either direction or would I have to make another half bridge to accomplish this

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