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Before heading out to terrorize the neighborhood, there are a few more steps to perform. It is recommended to check the TPS calibration to eliminate any idle surge issues and for optimum driveability. We used the TPS calibration tool from Fiveology Racing, which allows us to clamp our voltage meter right up to the two metal terminals without having to stab into the TPS wiring. Everything checked out great on our '88 GT; our TPS voltage was dialed in at 0.967 volts.