Just a sounding board!
I had a problem like that too...only my spedo would just conk out for a couple miles, then it would read correctly again. It is more than likely a connector that is loose, if it just happens every once in a while, but since you said that it fixes itself when you restart the car, I would think it is something with the ECU.
I don't know much about the wireing on Supra's, but common sense can usually lead you to some troubleshooting.
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My Ride: http://www.cardomain.com/ride/2351563
Our Supra’s, which art in the driveway,
Hollowed be thy power, thy mods are great, thy speed endless,
On the road or at the track. Give us this day free of cops,
And forgive us our impound charges, as we forgive those who are slow.
And lead us not into speed traps, and deliver us from the interceptors,
For thine is our car, the power, and the glory…forever and ever….amen.
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