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The 1966 Thunderbird indeed does have dashboard indicator lights as part of its original design. You should find indicators for items such as fuel level, temperature, oil pressure, alternator, and high beam status, among others. It sounds like some of your lights are working, such as the high beam indicator, but others are not.
The lack of illumination could be due to a few different problems. First, the bulbs themselves might have burnt out. They are usually relatively simple to replace once you gain access to the back of the instrument panel. If the problem isn't the bulbs, it could be the wiring or a fuse. You may also want to check the grounding wire. The ground is just as important as the power. Any corrosion or disconnection there might cause issues.
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