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Ask your mechanic if he has an infared gun. That's what I used to calibrate my gauge but its easy to tell if the thermostat works with it. A cruder but effective way also works. Start it cold and keep checking the upper hose. It should stay very cool till the stat opens. When it opens it will get hot fast (then see where the gauge is). Most stats fail by internally leaking so if it is bad the upper hose will gradually get warm instead of all at once. My 65 has a calibration hole under the gauge, I'm not sure about the bullet birds. See if your mechanic is comfortable calibrating your gauge.
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