If your Toyota Tundra needs a zero point calibration, there are a few things you need to do. First, you need to find a flat, level surface on which to park your vehicle. Once you've found a suitable spot, turn off all the lights and accessories on your vehicle. Next, engage the parking brake and put the transmission in neutral. With the engine off, press and release the brake pedal three times. Then, turn the ignition on, but don't start the engine. Press and release the brake pedal three more times. Finally, start the engine and drive forward slowly until the speedometer needle reaches 20 MPH. Once you reach 20 MPH, release the brake pedal and continue driving normally.