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Was your engine running? I found that it only resets the % indicated if the engine is not running.
Made that mistake once because I had forgotten to reset the indicator after changing the oil and was in a hurry to get somewhere...
I would guess that he hit reset on the DIC. That's what I did the first time. After trying the same thing 2-3 times without success I did a quick CF search and found the answer (shown above). BTW, you turn the key on, but do not start the engine.
Your owners manual says just press reset on the DIC but the service manual says to press gas pedal 3 times from idle to wide open throttle with the key on BEFORE you change the oil. I've reset mine by doing reset sometimes a dozen times. Need to try the throttle thing next time.